diff --git a/lib/systems/default.nix b/lib/systems/default.nix
index 8f5ef44ae72f..0b3475fefb9c 100644
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -32,6 +32,7 @@ rec {
         else if final.isUClibc              then "uclibc"
         else if final.isAndroid             then "bionic"
         else if final.isLinux /* default */ then "glibc"
+        else if final.isAvr                 then "avrlibc"
         # TODO(@Ericson2314) think more about other operating systems
         else                                     "native/impure";
       extensions = {
diff --git a/lib/systems/examples.nix b/lib/systems/examples.nix
index 8ba03a63fd8d..a40c38924245 100644
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -99,6 +99,34 @@ rec {
   riscv64 = riscv "64";
   riscv32 = riscv "32";
 
+  avr = {
+    config = "avr";
+  };
+
+  arm-embedded = {
+    config = "arm-none-eabi";
+    libc = "newlib";
+  };
+
+  aarch64-embedded = {
+    config = "aarch64-none-elf";
+    libc = "newlib";
+  };
+
+  ppc-embedded = {
+    config = "powerpc-none-eabi";
+    libc = "newlib";
+  };
+
+  i686-embedded = {
+    config = "i686-elf";
+    libc = "newlib";
+  };
+
+  x86_64-embedded = {
+    config = "x86_64-elf";
+    libc = "newlib";
+  };
 
   #
   # Darwin
diff --git a/lib/systems/inspect.nix b/lib/systems/inspect.nix
index 65f560328af5..2fcf1afe4628 100644
--- a/lib/systems/inspect.nix
+++ b/lib/systems/inspect.nix
@@ -19,6 +19,7 @@ rec {
     isRiscV        = { cpu = { family = "riscv"; }; };
     isSparc        = { cpu = { family = "sparc"; }; };
     isWasm         = { cpu = { family = "wasm"; }; };
+    isAvr          = { cpu = { family = "avr"; }; };
 
     is32bit        = { cpu = { bits = 32; }; };
     is64bit        = { cpu = { bits = 64; }; };
diff --git a/lib/systems/parse.nix b/lib/systems/parse.nix
index bb26c93f3d7a..db97a5c4b33b 100644
--- a/lib/systems/parse.nix
+++ b/lib/systems/parse.nix
@@ -101,6 +101,8 @@ rec {
 
     wasm32   = { bits = 32; significantByte = littleEndian; family = "wasm"; };
     wasm64   = { bits = 64; significantByte = littleEndian; family = "wasm"; };
+
+    avr      = { bits = 8; family = "avr"; };
   };
 
   ################################################################################
@@ -117,6 +119,7 @@ rec {
     apple = {};
     pc = {};
 
+    none = {};
     unknown = {};
   };
 
@@ -200,6 +203,7 @@ rec {
     cygnus       = {};
     msvc         = {};
     eabi         = {};
+    elf         = {};
 
     androideabi  = {};
     android      = {
@@ -255,9 +259,16 @@ rec {
     setType "system" components;
 
   mkSkeletonFromList = l: {
+    "1" = if elemAt l 0 == "avr"
+      then { cpu = elemAt l 0; kernel = "none"; abi = "unknown"; }
+      else throw "Target specification with 1 components is ambiguous";
     "2" = # We only do 2-part hacks for things Nix already supports
       if elemAt l 1 == "cygwin"
         then { cpu = elemAt l 0;                      kernel = "windows";  abi = "cygnus";   }
+      else if (elemAt l 1 == "eabi")
+        then { cpu = elemAt l 0; vendor = "none"; kernel = "none"; abi = elemAt l 1; }
+      else if (elemAt l 1 == "elf")
+        then { cpu = elemAt l 0; vendor = "none"; kernel = "none"; abi = elemAt l 1; }
       else   { cpu = elemAt l 0;                      kernel = elemAt l 1;                   };
     "3" = # Awkwards hacks, beware!
       if elemAt l 1 == "apple"
@@ -268,6 +279,10 @@ rec {
         then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "windows";  abi = "gnu"; }
       else if hasPrefix "netbsd" (elemAt l 2)
         then { cpu = elemAt l 0; vendor = elemAt l 1;    kernel = elemAt l 2;                }
+      else if (elemAt l 2 == "eabi")
+        then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "none"; abi = elemAt l 2; }
+      else if (elemAt l 2 == "elf")
+        then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "none"; abi = elemAt l 2; }
       else throw "Target specification with 3 components is ambiguous";
     "4" =    { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; abi = elemAt l 3; };
   }.${toString (length l)}
diff --git a/pkgs/applications/audio/axoloti/default.nix b/pkgs/applications/audio/axoloti/default.nix
index 274233167bd8..3c3198e17348 100644
--- a/pkgs/applications/audio/axoloti/default.nix
+++ b/pkgs/applications/audio/axoloti/default.nix
@@ -1,5 +1,6 @@
 { stdenv, fetchFromGitHub, fetchurl, makeWrapper, unzip
-, gnumake, gcc-arm-embedded, dfu-util-axoloti, jdk, ant, libfaketime }:
+, gnumake, gcc-arm-embedded, binutils-arm-embedded
+, dfu-util-axoloti, jdk, ant, libfaketime }:
 
 stdenv.mkDerivation rec {
   version = "1.0.12-2";
@@ -20,7 +21,15 @@ stdenv.mkDerivation rec {
     sha256 = "0lb5s8pkj80mqhsy47mmq0lqk34s2a2m3xagzihalvabwd0frhlj";
   };
 
-  buildInputs = [ makeWrapper unzip gcc-arm-embedded dfu-util-axoloti jdk ant libfaketime ];
+  nativeBuildInputs = [
+    makeWrapper
+    unzip
+    gcc-arm-embedded
+    binutils-arm-embedded
+    dfu-util-axoloti
+    ant
+  ];
+  buildInputs = [jdk libfaketime ];
 
   patchPhase = ''
     unzip ${chibios}
diff --git a/pkgs/applications/misc/avrdudess/default.nix b/pkgs/applications/misc/avrdudess/default.nix
index c803eb37ad6f..1144d5152847 100644
--- a/pkgs/applications/misc/avrdudess/default.nix
+++ b/pkgs/applications/misc/avrdudess/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, unzip, mono, avrbinutils, avrgcc, avrdude, gtk2, xdg_utils }:
+{ stdenv, fetchurl, unzip, mono, avrdude, gtk2, xdg_utils }:
 
 stdenv.mkDerivation rec {
   name = "avrdudess-2.2.20140102";
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     export LD_LIBRARY_PATH="${stdenv.lib.makeLibraryPath [gtk2 mono]}"
     # We need PATH from user env for xdg-open to find its tools, which
     # typically depend on the currently running desktop environment.
-    export PATH="${stdenv.lib.makeBinPath [ avrgcc avrbinutils avrdude xdg_utils ]}:\$PATH"
+    export PATH="${stdenv.lib.makeBinPath [ avrdude xdg_utils ]}:\$PATH"
 
     # avrdudess must have its resource files in its current working directory
     cd $out/avrdudess && exec ${mono}/bin/mono "$out/avrdudess/avrdudess.exe" "\$@"
diff --git a/pkgs/applications/misc/opentx/default.nix b/pkgs/applications/misc/opentx/default.nix
index 8a941a719f29..0aecc43d1e53 100644
--- a/pkgs/applications/misc/opentx/default.nix
+++ b/pkgs/applications/misc/opentx/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub
-, cmake, gcc-arm-embedded, python
+, cmake, gcc-arm-embedded, binutils-arm-embedded, python
 , qt5, SDL, gmock
 , dfu-util, avrdude
 }:
@@ -21,10 +21,12 @@ in stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
-  nativeBuildInputs = [ cmake ];
+  nativeBuildInputs = [
+    cmake
+    gcc-arm-embedded binutils-arm-embedded
+  ];
 
   buildInputs = with qt5; [
-    gcc-arm-embedded
     python python.pkgs.pyqt4
     qtbase qtmultimedia qttranslations
     SDL gmock
diff --git a/pkgs/build-support/bintools-wrapper/default.nix b/pkgs/build-support/bintools-wrapper/default.nix
index f9ca245beea6..3ac1e52f3092 100644
--- a/pkgs/build-support/bintools-wrapper/default.nix
+++ b/pkgs/build-support/bintools-wrapper/default.nix
@@ -186,6 +186,7 @@ stdenv.mkDerivation {
         }.${targetPlatform.parsed.cpu.name}
       else if targetPlatform.isPower then if targetPlatform.isBigEndian then "ppc" else "lppc"
       else if targetPlatform.isSparc then "sparc"
+      else if targetPlatform.isAvr then "avr"
       else throw "unknown emulation for platform: " + targetPlatform.config;
     in targetPlatform.platform.bfdEmulation or (fmt + sep + arch);
 
@@ -209,7 +210,7 @@ stdenv.mkDerivation {
       ## General libc support
       ##
 
-      echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags
+      echo "-L${libc_lib}${libc.libdir or "/lib"}" > $out/nix-support/libc-ldflags
 
       echo "${libc_lib}" > $out/nix-support/orig-libc
       echo "${libc_dev}" > $out/nix-support/orig-libc-dev
@@ -292,6 +293,16 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" pic"
     ''
 
+    + optionalString targetPlatform.isAvr ''
+      hardening_unsupported_flags+=" relro bindnow"
+    ''
+
+    + optionalString (libc != null && targetPlatform.isAvr) ''
+      for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
+        echo "-L${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
+      done
+    ''
+
     + ''
       set +u
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index e59758371a38..06aa9436bfc0 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -232,7 +232,7 @@ stdenv.mkDerivation {
       # compile, because it uses "#include_next <limits.h>" to find the
       # limits.h file in ../includes-fixed. To remedy the problem,
       # another -idirafter is necessary to add that directory again.
-      echo "-B${libc_lib}/lib/ -idirafter ${libc_dev}/include ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
+      echo "-B${libc_lib}${libc.libdir or "/lib/"} -idirafter ${libc_dev}${libc.incdir or "/include"} ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
 
       echo "${libc_lib}" > $out/nix-support/orig-libc
       echo "${libc_dev}" > $out/nix-support/orig-libc-dev
@@ -284,6 +284,20 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" stackprotector"
     ''
 
+    + optionalString targetPlatform.isAvr ''
+      hardening_unsupported_flags+=" stackprotector pic"
+    ''
+
+    + optionalString (targetPlatform.libc == "newlib") ''
+      hardening_unsupported_flags+=" stackprotector fortify pie pic"
+    ''
+
+    + optionalString (libc != null && targetPlatform.isAvr) ''
+      for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
+        echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
+      done
+    ''
+
     + ''
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
       substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
diff --git a/pkgs/development/compilers/gcc-arm-embedded/6/default.nix b/pkgs/development/compilers/gcc-arm-embedded/6/default.nix
deleted file mode 100644
index 945649b29781..000000000000
--- a/pkgs/development/compilers/gcc-arm-embedded/6/default.nix
+++ /dev/null
@@ -1,45 +0,0 @@
-{ stdenv, fetchurl, ncurses5, python27 }:
-
-stdenv.mkDerivation rec {
-  name = "gcc-arm-embedded-${version}";
-  version = "6-2017-q2-update";
-  subdir = "6-2017q2";
-
-  platformString =
-    if stdenv.isLinux then "linux"
-    else if stdenv.isDarwin then "mac"
-    else throw "unsupported platform";
-
-  urlString = "https://developer.arm.com/-/media/Files/downloads/gnu-rm/${subdir}/gcc-arm-none-eabi-${version}-${platformString}.tar.bz2";
-
-  src =
-    if stdenv.isLinux then fetchurl { url=urlString; sha256="1hvwi02mx34al525sngnl0cm7dkmzxfkb1brq9kvbv28wcplp3p6"; }
-    else if stdenv.isDarwin then fetchurl { url=urlString; sha256="0019ylpq4inq7p5gydpmc9m8ni72fz2csrjlqmgx1698998q0c3x"; }
-    else throw "unsupported platform";
-
-  phases = [ "unpackPhase" "installPhase" "fixupPhase" ];
-
-  installPhase = ''
-    mkdir -p $out
-    cp -r * $out
-  '';
-
-  dontPatchELF = true;
-  dontStrip = true;
-
-  preFixup = ''
-    find $out -type f | while read f; do
-      patchelf $f > /dev/null 2>&1 || continue
-      patchelf --set-interpreter $(cat ${stdenv.cc}/nix-support/dynamic-linker) "$f" || true
-      patchelf --set-rpath ${stdenv.lib.makeLibraryPath [ "$out" stdenv.cc.cc ncurses5 python27 ]} "$f" || true
-    done
-  '';
-
-  meta = {
-    description = "Pre-built GNU toolchain from ARM Cortex-M & Cortex-R processors (Cortex-M0/M0+/M3/M4/M7, Cortex-R4/R5/R7/R8)";
-    homepage = https://developer.arm.com/open-source/gnu-toolchain/gnu-rm;
-    license = with stdenv.lib.licenses; [ bsd2 gpl2 gpl3 lgpl21 lgpl3 mit ];
-    maintainers = with stdenv.lib.maintainers; [ vinymeuh ];
-    platforms = with stdenv.lib.platforms; linux ++ darwin;
-  };
-}
diff --git a/pkgs/development/compilers/gcc-arm-embedded/7/default.nix b/pkgs/development/compilers/gcc-arm-embedded/7/default.nix
deleted file mode 100644
index c22683dae03a..000000000000
--- a/pkgs/development/compilers/gcc-arm-embedded/7/default.nix
+++ /dev/null
@@ -1,39 +0,0 @@
-{ stdenv, lib, fetchurl, ncurses5, python27 }:
-
-with lib;
-
-stdenv.mkDerivation rec {
-  name = "gcc-arm-embedded-${version}";
-  version = "7-2018-q2-update";
-  subdir = "7-2018q2";
-
-  urlString = "https://developer.arm.com/-/media/Files/downloads/gnu-rm/${subdir}/gcc-arm-none-eabi-${version}-linux.tar.bz2";
-
-  src = fetchurl { url=urlString; sha256="0sgysp3hfpgrkcbfiwkp0a7ymqs02khfbrjabm52b5z61sgi05xv"; };
-
-  phases = [ "unpackPhase" "installPhase" "fixupPhase" ];
-
-  installPhase = ''
-    mkdir -p $out
-    cp -r * $out
-  '';
-
-  dontPatchELF = true;
-  dontStrip = true;
-
-  preFixup = ''
-    find $out -type f | while read f; do
-      patchelf $f > /dev/null 2>&1 || continue
-      patchelf --set-interpreter $(cat ${stdenv.cc}/nix-support/dynamic-linker) "$f" || true
-      patchelf --set-rpath ${stdenv.lib.makeLibraryPath [ "$out" stdenv.cc.cc ncurses5 python27 ]} "$f" || true
-    done
-  '';
-
-  meta = {
-    description = "Pre-built GNU toolchain from ARM Cortex-M & Cortex-R processors (Cortex-M0/M0+/M3/M4/M7, Cortex-R4/R5/R7/R8)";
-    homepage = https://developer.arm.com/open-source/gnu-toolchain/gnu-rm;
-    license = with licenses; [ bsd2 gpl2 gpl3 lgpl21 lgpl3 mit ];
-    maintainers = with maintainers; [ prusnak ];
-    platforms = platforms.linux;
-  };
-}
diff --git a/pkgs/development/compilers/gcc-arm-embedded/default.nix b/pkgs/development/compilers/gcc-arm-embedded/default.nix
deleted file mode 100644
index 039b5a9ce362..000000000000
--- a/pkgs/development/compilers/gcc-arm-embedded/default.nix
+++ /dev/null
@@ -1,50 +0,0 @@
-{ stdenv, bzip2, patchelf, glibc, gcc, fetchurl, version, releaseType, sha256, ncurses
-, dirName ? null, subdirName ? null }:
-with stdenv.lib;
-let
-  versionParts = splitString "-" version; # 4.7 2013q3 20130916
-  majorVersion = elemAt versionParts 0; # 4.7
-  yearQuarter = elemAt versionParts 1; # 2013q3
-  underscoreVersion = replaceChars ["."] ["_"] version; # 4_7-2013q3-20130916
-  yearQuarterParts = splitString "q" yearQuarter; # 2013 3
-  year = elemAt yearQuarterParts 0; # 2013
-  quarter = elemAt yearQuarterParts 1; # 3
-  dirName_ = if dirName != null then dirName else majorVersion;
-  subdirName_ = if subdirName != null then subdirName
-    else "${majorVersion}-${year}-q${quarter}-${releaseType}"; # 4.7-2013-q3-update
-in
-stdenv.mkDerivation {
-  name = "gcc-arm-embedded-${version}";
-
-  src = fetchurl {
-    url = "https://launchpad.net/gcc-arm-embedded/${dirName_}/${subdirName_}/+download/gcc-arm-none-eabi-${underscoreVersion}-linux.tar.bz2";
-    sha256 = sha256;
-  };
-
-  nativeBuildInputs = [ bzip2 patchelf ];
-
-  dontPatchELF = true;
-
-  phases = "unpackPhase patchPhase installPhase";
-
-  installPhase = ''
-    mkdir -pv $out
-    cp -r ./* $out
-
-    for f in $(find $out); do
-      if [ -f "$f" ] && patchelf "$f" 2> /dev/null; then
-        patchelf --set-interpreter ${getLib glibc}/lib/ld-linux.so.2 \
-                 --set-rpath ${stdenv.lib.makeLibraryPath [ "$out" gcc ncurses ]} \
-                 "$f" || true
-      fi
-    done
-  '';
-
-  meta = with stdenv.lib; {
-    description = "Pre-built GNU toolchain from ARM Cortex-M & Cortex-R processors (Cortex-M0/M0+/M3/M4, Cortex-R4/R5/R7)";
-    homepage = https://launchpad.net/gcc-arm-embedded;
-    license = with licenses; [ bsd2 gpl2 gpl3 lgpl21 lgpl3 mit ];
-    maintainers = [ maintainers.rasendubi ];
-    platforms = platforms.linux;
-  };
-}
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index d9376f597a70..e585f296e877 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -130,7 +130,7 @@ let version = "4.8.5";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -148,10 +148,15 @@ let version = "4.8.5";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -270,7 +275,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -360,20 +365,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${libcCross.dev}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index c60f54f1560c..9dae061ecbb3 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -135,7 +135,7 @@ let version = "4.9.4";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -156,10 +156,15 @@ let version = "4.9.4";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -292,7 +297,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -381,20 +386,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 47c849d2dcc8..fbc192752c72 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -122,7 +122,7 @@ let version = "5.5.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -143,10 +143,15 @@ let version = "5.5.0";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -296,7 +301,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -387,20 +392,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index eeb57be97157..793752dee19e 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -120,7 +120,7 @@ let version = "6.4.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -143,10 +143,15 @@ let version = "6.4.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -301,7 +306,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -391,20 +396,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 59897ccff426..c75a6c6e68f8 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -67,7 +67,7 @@ let version = "7.3.0";
       [ "--with-as=${targetPackages.stdenv.cc.bintools}/bin/${targetPlatform.config}-as"
         "--with-ld=${targetPackages.stdenv.cc.bintools}/bin/${targetPlatform.config}-ld" ] ++
       (if crossMingw && crossStageStatic then [
-        "--with-headers=${libcCross}/include"
+        "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}"
         "--with-gcc"
         "--with-gnu-as"
         "--with-gnu-ld"
@@ -92,7 +92,7 @@ let version = "7.3.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -115,11 +115,17 @@ let version = "7.3.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
-        ]));
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            # No final libdecnumber (it may work only in 386)
+            "--disable-decimal-float"
+          ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
 
@@ -188,7 +194,12 @@ stdenv.mkDerivation ({
             sed -i gcc/config/linux.h -e '1i#undef LOCAL_INCLUDE_DIR'
         ''
         )
-    else "");
+    else "")
+      + stdenv.lib.optionalString targetPlatform.isAvr ''
+        makeFlagsArray+=(
+           'LIMITS_H_TEST=false'
+        )
+      '';
 
   inherit noSysDirs staticCompiler crossStageStatic
     libcCross crossMingw;
@@ -267,7 +278,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -334,20 +345,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index 7842110a2146..bcac577712aa 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -87,7 +87,7 @@ let version = "8.2.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -110,10 +110,15 @@ let version = "8.2.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
@@ -261,7 +266,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -322,23 +327,16 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}/include"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
-    ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/snapshot/default.nix b/pkgs/development/compilers/gcc/snapshot/default.nix
index 0de6be36c351..a308abd9c16f 100644
--- a/pkgs/development/compilers/gcc/snapshot/default.nix
+++ b/pkgs/development/compilers/gcc/snapshot/default.nix
@@ -104,10 +104,15 @@ let version = "7-20170409";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
@@ -290,20 +295,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/mentor/default.nix b/pkgs/development/compilers/mentor/default.nix
deleted file mode 100644
index 4f09df7f2ea0..000000000000
--- a/pkgs/development/compilers/mentor/default.nix
+++ /dev/null
@@ -1,80 +0,0 @@
-# Sourcery CodeBench Lite toolchain(s) (GCC) from Mentor Graphics
-
-{ stdenv, fetchurl, patchelf, ncurses }:
-
-let
-
-  buildToolchain =
-    { name, src, description }:
-
-    stdenv.mkDerivation rec {
-      inherit name src;
-
-      nativeBuildInputs = [ patchelf ];
-
-      buildCommand = ''
-        # Unpack tarball
-        mkdir -p "$out"
-        tar --strip-components=1 -xjf "$src" -C "$out"
-
-        # Patch binaries
-        interpreter="$(cat "$NIX_CC"/nix-support/dynamic-linker)"
-        for file in "$out"/bin/* "$out"/libexec/gcc/*/*/* "$out"/*/bin/*; do
-            # Skip non-executable files
-            case "$file" in
-              *README.txt) echo "skipping $file"; continue;;
-              *liblto_plugin.so*) echo "skipping $file"; continue;;
-            esac
-
-            # Skip directories
-            test -d "$file" && continue
-
-            echo "patchelf'ing $file"
-            patchelf --set-interpreter "$interpreter" "$file"
-
-            # GDB needs ncurses
-            case "$file" in
-              *gdb) patchelf --set-rpath "${ncurses.out}/lib" "$file";;
-            esac
-        done
-
-        # Manpages
-        mkdir -p "$out/share/man"
-        ln -s "$out"/share/doc/*/man/man1 "$out/share/man/man1"
-        ln -s "$out"/share/doc/*/man/man7 "$out/share/man/man7"
-      '';
-
-      meta = with stdenv.lib; {
-        inherit description;
-        homepage = https://www.mentor.com/embedded-software/sourcery-tools/sourcery-codebench/editions/lite-edition/;
-        license = licenses.gpl3;
-        platforms = platforms.linux;
-        maintainers = [ maintainers.bjornfor ];
-      };
-    };
-
-in
-
-{
-
-  armLinuxGnuEabi = let version = "2013.05-24"; in buildToolchain rec {
-    name = "sourcery-codebench-lite-arm-linux-gnueabi-${version}";
-    description = "Sourcery CodeBench Lite toolchain (GCC) for ARM GNU/Linux, from Mentor Graphics";
-    src = fetchurl {
-      url = "http://sourcery.mentor.com/public/gnu_toolchain/arm-none-linux-gnueabi/arm-${version}-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2";
-      sha256 = "1xb075ia61c59cya2jl8zp4fvqpfnwkkc5330shvgdlg9981qprr";
-    };
-  };
-
-  armEabi = let version = "2013.05-23"; in buildToolchain rec {
-    name = "sourcery-codebench-lite-arm-eabi-${version}";
-    description = "Sourcery CodeBench Lite toolchain (GCC) for ARM EABI, from Mentor Graphics";
-    src = fetchurl {
-      url = "http://sourcery.mentor.com/public/gnu_toolchain/arm-none-eabi/arm-${version}-arm-none-eabi-i686-pc-linux-gnu.tar.bz2";
-      sha256 = "0nbvdwj3kcv9scx808gniqp0ncdiy2i7afmdvribgkz1lsfin923";
-    };
-  };
-
-  # TODO: Sourcery CodeBench is also available for MIPS, Power, SuperH,
-  # ColdFire (and more).
-}
diff --git a/pkgs/development/compilers/microscheme/default.nix b/pkgs/development/compilers/microscheme/default.nix
index cfee1b0d8639..f15a76243277 100644
--- a/pkgs/development/compilers/microscheme/default.nix
+++ b/pkgs/development/compilers/microscheme/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, vim, avrdude, avrbinutils, avrgcc, avrlibc, makeWrapper }:
+{ stdenv, fetchzip, vim, makeWrapper }:
 
 stdenv.mkDerivation rec {
   name = "microscheme-${version}";
@@ -10,15 +10,10 @@ stdenv.mkDerivation rec {
     sha256 = "1r3ng4pw1s9yy1h5rafra1rq19d3vmb5pzbpcz1913wz22qdd976";
   };
 
-  # Just a guess
-  propagatedBuildInputs = [ avrlibc ];
   buildInputs = [ makeWrapper vim ];
 
   installPhase = ''
     make install PREFIX=$out
-
-    wrapProgram $out/bin/microscheme \
-      --prefix PATH : "${stdenv.lib.makeBinPath [ avrdude avrgcc avrbinutils ]}"
   '';
 
   meta = with stdenv.lib; {
diff --git a/pkgs/development/misc/avr/binutils/default.nix b/pkgs/development/misc/avr/binutils/default.nix
deleted file mode 100644
index 83ba93e63b76..000000000000
--- a/pkgs/development/misc/avr/binutils/default.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-{ stdenv, fetchurl }:
-
-let
-  version = "2.31.1";
-in
-stdenv.mkDerivation {
-  name = "avr-binutils-${version}";
-
-  src = fetchurl {
-    url = "mirror://gnu/binutils/binutils-${version}.tar.bz2";
-    sha256 = "1l34hn1zkmhr1wcrgf0d4z7r3najxnw3cx2y2fk7v55zjlk3ik7z";
-  };
-  configureFlags = [ "--target=avr" "--enable-languages=c,c++" ];
-
-  meta = with stdenv.lib; {
-    description = "the GNU Binutils for AVR microcontrollers";
-    homepage = http://www.gnu.org/software/binutils/;
-    license = licenses.gpl3Plus;
-    platforms = platforms.unix;
-    maintainers = with maintainers; [ mguentner ];
-  };
-}
diff --git a/pkgs/development/misc/avr/gcc/avrbinutils-path.patch b/pkgs/development/misc/avr/gcc/avrbinutils-path.patch
deleted file mode 100644
index f0ec21b7589f..000000000000
--- a/pkgs/development/misc/avr/gcc/avrbinutils-path.patch
+++ /dev/null
@@ -1,15 +0,0 @@
-diff --git a/gcc/gcc-ar.c b/gcc/gcc-ar.c
-index 838ebc2..3ac4ee7 100644
---- a/gcc/gcc-ar.c
-+++ b/gcc/gcc-ar.c
-@@ -118,8 +118,8 @@ setup_prefixes (const char *exec_path)
- 				dir_separator, NULL);
-   prefix_from_string (self_libexec_prefix, &target_path);
- 
--  /* Add path as a last resort.  */
--  prefix_from_env ("PATH", &path);
-+  /* Add path to avrbinutils.  */
-+  prefix_from_string ("@avrbinutils@/bin", &path);
- }
- 
- int 
diff --git a/pkgs/development/misc/avr/gcc/default.nix b/pkgs/development/misc/avr/gcc/default.nix
deleted file mode 100644
index 5c9b56c99183..000000000000
--- a/pkgs/development/misc/avr/gcc/default.nix
+++ /dev/null
@@ -1,60 +0,0 @@
-{ stdenv, fetchurl, gmp, mpfr, libmpc, zlib, avrbinutils, texinfo }:
-
-let
-  version = "8.2.0";
-in
-stdenv.mkDerivation {
-
-  name = "avr-gcc-${version}";
-  src = fetchurl {
-    url = "mirror://gcc/releases/gcc-${version}/gcc-${version}.tar.xz";
-    sha256 = "10007smilswiiv2ymazr3b6x2i933c0ycxrr529zh4r6p823qv0r";
-  };
-
-  patches = [
-    ./avrbinutils-path.patch
-  ];
-
-  # avrbinutils-path.patch introduces a reference to @avrbinutils@, substitute
-  # it now.
-  postPatch = ''
-    substituteInPlace gcc/gcc-ar.c --subst-var-by avrbinutils ${avrbinutils}
-  '';
-
-  buildInputs = [ gmp mpfr libmpc zlib avrbinutils ];
-
-  nativeBuildInputs = [ texinfo ];
-
-  hardeningDisable = [ "format" ];
-
-  stripDebugList= [ "bin" "libexec" ];
-
-  enableParallelBuilding = true;
-
-  configurePhase = ''
-    mkdir gcc-build
-    cd gcc-build
-    ../configure   \
-    --prefix=$out  \
-    --host=$CHOST  \
-    --build=$CHOST \
-    --target=avr   \
-    --with-as=${avrbinutils}/bin/avr-as \
-    --with-gnu-as  \
-    --with-gnu-ld  \
-    --with-ld=${avrbinutils}/bin/avr-ld \
-    --with-system-zlib \
-    --disable-install-libiberty \
-    --disable-nls \
-    --disable-libssp \
-    --with-dwarf2 \
-    --enable-languages=c,c++'';
-
-  meta = with stdenv.lib; {
-    description = "GNU Compiler Collection, version ${version} for AVR microcontrollers";
-    homepage = http://gcc.gnu.org;
-    license = licenses.gpl3Plus;
-    platforms = with platforms; linux ++ darwin;
-    maintainers = with maintainers; [ mguentner ];
-  };
-}
diff --git a/pkgs/development/misc/avr/libc/default.nix b/pkgs/development/misc/avr/libc/default.nix
index 039846d5fcfb..afe30e4b5eef 100644
--- a/pkgs/development/misc/avr/libc/default.nix
+++ b/pkgs/development/misc/avr/libc/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, avrgcc, avrbinutils, automake, autoconf }:
+{ stdenv, fetchurl, automake, autoconf }:
 
 let
   version = "2.0.0";
@@ -11,28 +11,21 @@ stdenv.mkDerivation {
     sha256 = "15svr2fx8j6prql2il2fc0ppwlv50rpmyckaxx38d3gxxv97zpdj";
   };
 
-  buildInputs = [ avrgcc avrbinutils automake autoconf ];
-  configurePhase = ''
-    unset LD
-    unset AS
-    unset AR
-    unset CC
-    unset CXX
-    unset RANLIB
-    unset STRIP
-
-    ./configure --prefix=$out --build=$(./config.guess) --host=avr
-  '';
+  nativeBuildInputs = [ automake autoconf ];
 
   # Make sure we don't strip the libraries in lib/gcc/avr.
-  stripDebugList= "bin";
+  stripDebugList = "bin";
   dontPatchELF = true;
 
+  passthru = {
+    incdir = "/avr/include";
+  };
+
   meta = with stdenv.lib; {
     description = "a C runtime library for AVR microcontrollers";
     homepage = http://savannah.nongnu.org/projects/avr-libc/;
     license = licenses.bsd3;
-    platforms = platforms.unix;
+    platforms = platforms.all;
     maintainers = with maintainers; [ mguentner ];
   };
 }
diff --git a/pkgs/development/misc/newlib/default.nix b/pkgs/development/misc/newlib/default.nix
new file mode 100644
index 000000000000..693cfa093b08
--- /dev/null
+++ b/pkgs/development/misc/newlib/default.nix
@@ -0,0 +1,35 @@
+{ stdenv, fetchurl, buildPackages }:
+
+let version = "3.0.0";
+in stdenv.mkDerivation {
+  name = "newlib-${version}";
+  src = fetchurl {
+    url = "ftp://sourceware.org/pub/newlib/newlib-${version}.tar.gz";
+    sha256 = "0chka3szh50krcz2dcxcsr1v1i000jylwnsrp2pgrrblxqsn6mn8";
+  };
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+  # newlib expects CC to build for build platform, not host platform
+  preConfigure = ''
+    export CC=cc
+  '';
+
+  configurePlatforms = [ "build" "target" ];
+  configureFlags = [
+    "--host=${stdenv.buildPlatform.config}"
+
+    "--disable-newlib-supplied-syscalls"
+    "--disable-nls"
+    "--enable-newlib-io-long-long"
+    "--enable-newlib-register-fini"
+    "--enable-newlib-retargetable-locking"
+  ];
+
+  dontDisableStatic = true;
+
+  passthru = {
+    incdir = "/${stdenv.targetPlatform.config}/include";
+    libdir = "/${stdenv.targetPlatform.config}/lib";
+  };
+}
diff --git a/pkgs/development/misc/qmk_firmware/default.nix b/pkgs/development/misc/qmk_firmware/default.nix
new file mode 100644
index 000000000000..0a7b4fd9d9a7
--- /dev/null
+++ b/pkgs/development/misc/qmk_firmware/default.nix
@@ -0,0 +1,27 @@
+{ stdenv, fetchFromGitHub
+, avrgcc, avrbinutils
+, gcc-arm-embedded, binutils-arm-embedded
+, teensy-loader-cli, dfu-programmer, dfu-util }:
+
+let version = "0.6.144";
+
+in stdenv.mkDerivation {
+  name = "qmk_firmware-${version}";
+  src = fetchFromGitHub {
+    owner = "qmk";
+    repo = "qmk_firmware";
+    rev = version;
+    sha256 = "0m71f9w32ksqjkrwhqwhr74q5v3pr38bihjyb9ks0k5id0inhrjn";
+    fetchSubmodules = true;
+  };
+  buildFlags = "all:default";
+  NIX_CFLAGS_COMPILE = "-Wno-error";
+  nativeBuildInputs = [
+    avrgcc
+    avrbinutils
+    gcc-arm-embedded
+    teensy-loader-cli
+    dfu-programmer
+    dfu-util
+  ];
+}
diff --git a/pkgs/development/misc/stm32/betaflight/default.nix b/pkgs/development/misc/stm32/betaflight/default.nix
index 0c601c7773cc..21230464e747 100644
--- a/pkgs/development/misc/stm32/betaflight/default.nix
+++ b/pkgs/development/misc/stm32/betaflight/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub
-, gcc-arm-embedded, python2
+, gcc-arm-embedded, binutils-arm-embedded, python2
 , skipTargets ? [
   # These targets do not build, for the reasons listed, along with the last version checked.
   # Probably all of the issues with these targets need to be addressed upstream.
@@ -24,8 +24,8 @@ in stdenv.mkDerivation rec {
     sha256 = "1wyp23p876xbfi9z6gm4xn1nwss3myvrjjjq9pd3s0vf5gkclkg5";
   };
 
-  buildInputs = [
-    gcc-arm-embedded
+  nativeBuildInputs = [
+    gcc-arm-embedded binutils-arm-embedded
     python2
   ];
 
@@ -58,7 +58,6 @@ in stdenv.mkDerivation rec {
     homepage = https://github.com/betaflight/betaflight;
     license = licenses.gpl3;
     maintainers = with maintainers; [ elitak ];
-    platforms = [ "i686-linux" "x86_64-linux" ];
   };
 
 }
diff --git a/pkgs/development/misc/stm32/inav/default.nix b/pkgs/development/misc/stm32/inav/default.nix
index cb9cc80d3252..9c35ac2ffce1 100644
--- a/pkgs/development/misc/stm32/inav/default.nix
+++ b/pkgs/development/misc/stm32/inav/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub
-, gcc-arm-embedded, ruby
+, gcc-arm-embedded, binutils-arm-embedded, ruby
 }:
 
 let
@@ -17,8 +17,8 @@ in stdenv.mkDerivation rec {
     sha256 = "15zai8qf43b06fmws1sbkmdgip51zp7gkfj7pp9b6gi8giarzq3y";
   };
 
-  buildInputs = [
-    gcc-arm-embedded
+  nativeBuildInputs = [
+    gcc-arm-embedded binutils-arm-embedded
     ruby
   ];
 
@@ -50,7 +50,6 @@ in stdenv.mkDerivation rec {
     homepage = https://inavflight.github.io;
     license = licenses.gpl3;
     maintainers = with maintainers; [ elitak ];
-    platforms = [ "i686-linux" "x86_64-linux" ];
   };
 
 }
diff --git a/pkgs/development/tools/misc/blackmagic/default.nix b/pkgs/development/tools/misc/blackmagic/default.nix
index 2974c653acdd..281463528354 100644
--- a/pkgs/development/tools/misc/blackmagic/default.nix
+++ b/pkgs/development/tools/misc/blackmagic/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchFromGitHub
-, gcc-arm-embedded, libftdi
+, gcc-arm-embedded, binutils-arm-embedded, libftdi
 , python, pythonPackages
 }:
 
@@ -17,8 +17,11 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
+  nativeBuildInputs = [
+    gcc-arm-embedded binutils-arm-embedded
+  ];
+
   buildInputs = [
-    gcc-arm-embedded
     libftdi
     python
     pythonPackages.intelhex
diff --git a/pkgs/development/tools/misc/dfu-programmer/default.nix b/pkgs/development/tools/misc/dfu-programmer/default.nix
index 1c0f80e1ddd7..ba95889b5a80 100644
--- a/pkgs/development/tools/misc/dfu-programmer/default.nix
+++ b/pkgs/development/tools/misc/dfu-programmer/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     description = "A Device Firmware Update based USB programmer for Atmel chips with a USB bootloader";
     homepage = http://dfu-programmer.sourceforge.net/;
     maintainers = [ maintainers.the-kenny ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/tools/misc/teensy-loader-cli/default.nix b/pkgs/development/tools/misc/teensy-loader-cli/default.nix
index d6c5256ca84d..91f2a5c58fc2 100644
--- a/pkgs/development/tools/misc/teensy-loader-cli/default.nix
+++ b/pkgs/development/tools/misc/teensy-loader-cli/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
     sha256 = "1a663bv3lvm7bsf2wcaj2c0vpmniak7w5hwix5qgz608bvm2v781";
   };
 
-  buildInputs = [ unzip libusb ];
+  buildInputs = [ libusb ];
 
   installPhase = ''
     install -Dm755 teensy_loader_cli $out/bin/teensy-loader-cli
@@ -21,6 +21,6 @@ stdenv.mkDerivation {
     description = "Firmware uploader for the Teensy microcontroller boards";
     homepage = https://www.pjrc.com/teensy/;
     maintainers = with maintainers; [ the-kenny ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/tools/simavr/default.nix b/pkgs/development/tools/simavr/default.nix
index b009d5ed601b..e28aad40ef47 100644
--- a/pkgs/development/tools/simavr/default.nix
+++ b/pkgs/development/tools/simavr/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, fetchFromGitHub, avrbinutils, avrgcc, avrlibc, libelf, which, git, pkgconfig, freeglut
+{ stdenv, fetchFromGitHub, libelf, which, git, pkgconfig, freeglut
+, avrbinutils, avrgcc, avrlibc
 , libGLU_combined }:
 
 stdenv.mkDerivation rec {
@@ -15,14 +16,10 @@ stdenv.mkDerivation rec {
   # ld: cannot find -lsimavr
   enableParallelBuilding = false;
 
-  preConfigure = ''
-    substituteInPlace Makefile.common --replace "-I../simavr/sim/avr -I../../simavr/sim/avr" \
-    "-I${avrlibc}/avr/include -L${avrlibc}/avr/lib/avr5  -B${avrlibc}/avr/lib -I../simavr/sim/avr -I../../simavr/sim/avr"
-  '';
   buildFlags = "AVR_ROOT=${avrlibc}/avr SIMAVR_VERSION=${version}";
   installFlags = buildFlags + " DESTDIR=$(out)";
 
-  
+
   # Hack to avoid TMPDIR in RPATHs.
   preFixup = ''rm -rf "$(pwd)" && mkdir "$(pwd)" '';
 
@@ -31,8 +28,8 @@ stdenv.mkDerivation rec {
     patchelf --set-rpath "$(patchelf --print-rpath "$target"):$out/lib" "$target"
   '';
 
-  nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ which git avrbinutils avrgcc avrlibc libelf freeglut libGLU_combined ];
+  nativeBuildInputs = [ which git pkgconfig avrgcc avrbinutils ];
+  buildInputs = [ libelf freeglut libGLU_combined ];
 
   meta = with stdenv.lib; {
     description = "A lean and mean Atmel AVR simulator";
@@ -43,4 +40,3 @@ stdenv.mkDerivation rec {
   };
 
 }
-
diff --git a/pkgs/misc/gnuk/generic.nix b/pkgs/misc/gnuk/generic.nix
index 22aaa2d1cb57..80a4518f3f70 100644
--- a/pkgs/misc/gnuk/generic.nix
+++ b/pkgs/misc/gnuk/generic.nix
@@ -1,4 +1,4 @@
-{ stdenv, gcc-arm-embedded, makeWrapper
+{ stdenv, gcc-arm-embedded, binutils-arm-embedded, makeWrapper
 , python, pythonPackages
 
 # Extra options
@@ -14,7 +14,7 @@ stdenv.mkDerivation {
 
   inherit src;
 
-  nativeBuildInputs = [ gcc-arm-embedded makeWrapper ];
+  nativeBuildInputs = [ gcc-arm-embedded binutils-arm-embedded makeWrapper ];
   buildInputs = [ python ] ++ (with pythonPackages; [ pyusb colorama ]);
 
   configurePhase = ''
diff --git a/pkgs/misc/gnuk/git.nix b/pkgs/misc/gnuk/git.nix
deleted file mode 100644
index 142c4a0e7e5f..000000000000
--- a/pkgs/misc/gnuk/git.nix
+++ /dev/null
@@ -1,11 +0,0 @@
-{ callPackage, fetchgit, ... } @ args:
-
-callPackage ./generic.nix (args // rec {
-  version = "2015-04-22";
-
-  src = fetchgit {
-    url = "git://git.gniibe.org/gnuk/gnuk.git";
-    rev = "3d5a776ab15a4ae6e17d91341a58eda3db09f700";
-    sha256 = "1f9l1rwy630z8cnjd6lfv0zp6ij3c9ifbm3fym245049hh2xds7v";
-  };
-})
diff --git a/pkgs/misc/gnuk/unstable.nix b/pkgs/misc/gnuk/unstable.nix
deleted file mode 100644
index 16dbe5d21fc8..000000000000
--- a/pkgs/misc/gnuk/unstable.nix
+++ /dev/null
@@ -1,11 +0,0 @@
-{ callPackage, fetchgit, ... } @ args:
-
-callPackage ./generic.nix (args // rec {
-  version = "1.1.4";
-
-  src = fetchgit {
-    url = "git://git.gniibe.org/gnuk/gnuk.git";
-    rev = "e7e8b9f5ca414a5c901f61b0f043c8da42414103";
-    sha256 = "0js9dc1iyvrrcb0d8a2irivrli3yb7mxmpxws5a2n53hj5xc4n6l";
-  };
-})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 955258c9871b..5689301d8be2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -830,7 +830,10 @@ with pkgs;
     libssl = openssl;
   };
 
-  axoloti = callPackage ../applications/audio/axoloti { };
+  axoloti = callPackage ../applications/audio/axoloti {
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
+  };
   dfu-util-axoloti = callPackage ../applications/audio/axoloti/dfu-util.nix { };
   libusb1-axoloti = callPackage ../applications/audio/axoloti/libusb1.nix {
     inherit (darwin) libobjc;
@@ -6833,36 +6836,6 @@ with pkgs;
 
   gcl_2_6_13_pre = callPackage ../development/compilers/gcl/2.6.13-pre.nix { };
 
-  gcc-arm-embedded-4_7 = pkgsi686Linux.callPackage ../development/compilers/gcc-arm-embedded {
-    version = "4.7-2013q3-20130916";
-    releaseType = "update";
-    sha256 = "1bd9bi9q80xn2rpy0rn1vvj70rh15kb7dmah0qs4q2rv78fqj40d";
-    ncurses = pkgsi686Linux.ncurses5;
-  };
-  gcc-arm-embedded-4_8 = pkgsi686Linux.callPackage ../development/compilers/gcc-arm-embedded {
-    version = "4.8-2014q1-20140314";
-    releaseType = "update";
-    sha256 = "ce92859550819d4a3d1a6e2672ea64882b30afa2c08cf67fa8e1d93788c2c577";
-    ncurses = pkgsi686Linux.ncurses5;
-  };
-  gcc-arm-embedded-4_9 = pkgsi686Linux.callPackage ../development/compilers/gcc-arm-embedded {
-    version = "4.9-2015q1-20150306";
-    releaseType = "update";
-    sha256 = "c5e0025b065750bbd76b5357b4fc8606d88afbac9ff55b8a82927b4b96178154";
-    ncurses = pkgsi686Linux.ncurses5;
-  };
-  gcc-arm-embedded-5 = pkgs.pkgsi686Linux.callPackage ../development/compilers/gcc-arm-embedded {
-    dirName = "5.0";
-    subdirName = "5-2016-q2-update";
-    version = "5.4-2016q2-20160622";
-    releaseType = "update";
-    sha256 = "1r0rqbnw7rf94f5bsa3gi8bick4xb7qnp1dkvdjfbvqjvysvc44r";
-    ncurses = pkgsi686Linux.ncurses5;
-  };
-  gcc-arm-embedded-6 = callPackage ../development/compilers/gcc-arm-embedded/6 {};
-  gcc-arm-embedded-7 = callPackage ../development/compilers/gcc-arm-embedded/7 {};
-  gcc-arm-embedded = gcc-arm-embedded-7;
-
   gforth = callPackage ../development/compilers/gforth {};
 
   gtk-server = callPackage ../development/interpreters/gtk-server {};
@@ -7202,10 +7175,6 @@ with pkgs;
 
   manticore = callPackage ../development/compilers/manticore { };
 
-  mentorToolchains = recurseIntoAttrs (
-    pkgsi686Linux.callPackage ../development/compilers/mentor {}
-  );
-
   mercury = callPackage ../development/compilers/mercury { };
 
   microscheme = callPackage ../development/compilers/microscheme { };
@@ -7989,17 +7958,17 @@ with pkgs;
 
   amtk = callPackage ../development/libraries/amtk { };
 
-  avrgcclibc = throw "avrgcclibs are now separate packages, install avrbinutils, avrgcc and avrlibc";
-
-  avrbinutils = callPackage ../development/misc/avr/binutils {};
-
-  avrgcc      = callPackage ../development/misc/avr/gcc {};
-
-  avrlibc     = callPackage ../development/misc/avr/libc {};
+  avrlibc      = callPackage ../development/misc/avr/libc {};
+  avrlibcCross = callPackage ../development/misc/avr/libc {
+    stdenv = crossLibcStdenv;
+  };
 
   avr8burnomat = callPackage ../development/misc/avr8-burn-omat { };
 
-  betaflight = callPackage ../development/misc/stm32/betaflight { };
+  betaflight = callPackage ../development/misc/stm32/betaflight {
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
+  };
 
   sourceFromHead = callPackage ../build-support/source-from-head-fun.nix {};
 
@@ -8035,7 +8004,10 @@ with pkgs;
     guile = guile_2_0;
   };
 
-  inav = callPackage ../development/misc/stm32/inav { };
+  inav = callPackage ../development/misc/stm32/inav {
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
+  };
 
   pharo-vms = callPackage ../development/pharo/vm { };
   pharo = pharo-vms.multi-vm-wrapper;
@@ -8193,6 +8165,8 @@ with pkgs;
 
   blackmagic = callPackage ../development/tools/misc/blackmagic {
     stdenv = overrideCC stdenv gcc6;
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
   };
 
   bloaty = callPackage ../development/tools/bloaty { };
@@ -9740,6 +9714,8 @@ with pkgs;
     /**/ if name == "glibc" then targetPackages.glibcCross or glibcCross
     else if name == "bionic" then targetPackages.bionic
     else if name == "uclibc" then targetPackages.uclibcCross
+    else if name == "avrlibc" then targetPackages.avrlibcCross or avrlibcCross
+    else if name == "newlib" then targetPackages.newlibCross or newlibCross
     else if name == "musl" then targetPackages.muslCross or muslCross
     else if name == "msvcrt" then targetPackages.windows.mingw_w64 or windows.mingw_w64
     else if stdenv.targetPlatform.useiOSPrebuilt then targetPackages.darwin.iosSdkPkgs.libraries
@@ -12201,7 +12177,11 @@ with pkgs;
 
   graphite2 = callPackage ../development/libraries/silgraphite/graphite2.nix {};
 
-  simavr = callPackage ../development/tools/simavr { };
+  simavr = callPackage ../development/tools/simavr {
+    avrgcc = pkgsCross.avr.buildPackages.gcc;
+    avrbinutils = pkgsCross.avr.buildPackages.binutils;
+    avrlibc = pkgsCross.avr.libcCross;
+  };
 
   simgear = callPackage ../development/libraries/simgear { };
 
@@ -18299,7 +18279,10 @@ with pkgs;
 
   opentimestamps-client = python3Packages.callPackage ../tools/misc/opentimestamps-client {};
 
-  opentx = callPackage ../applications/misc/opentx { };
+  opentx = callPackage ../applications/misc/opentx {
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
+  };
 
   opera = callPackage ../applications/networking/browsers/opera {};
 
@@ -21982,14 +21965,9 @@ with pkgs;
   gnome-breeze = callPackage ../misc/themes/gnome-breeze { };
 
   gnuk = callPackage ../misc/gnuk {
-    gcc-arm-embedded = gcc-arm-embedded-4_9;
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
   };
-  gnuk-unstable = lowPrio (callPackage ../misc/gnuk/unstable.nix {
-    gcc-arm-embedded = gcc-arm-embedded-4_9;
-  });
-  gnuk-git = lowPrio (callPackage ../misc/gnuk/git.nix {
-    gcc-arm-embedded = gcc-arm-embedded-4_9;
-  });
 
   greybird = callPackage ../misc/themes/greybird { };
 
@@ -22835,4 +22813,16 @@ with pkgs;
   };
 
   tsung = callPackage ../applications/networking/tsung {};
+
+  qmk_firmware = callPackage ../development/misc/qmk_firmware {
+    avrgcc = pkgsCross.avr.buildPackages.gcc;
+    avrbinutils = pkgsCross.avr.buildPackages.binutils;
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
+  };
+
+  newlib = callPackage ../development/misc/newlib { };
+  newlibCross = callPackage ../development/misc/newlib {
+    stdenv = crossLibcStdenv;
+  };
 }
diff --git a/pkgs/top-level/release-cross.nix b/pkgs/top-level/release-cross.nix
index 89a8af6794f6..755297264625 100644
--- a/pkgs/top-level/release-cross.nix
+++ b/pkgs/top-level/release-cross.nix
@@ -12,6 +12,12 @@ with import ./release-lib.nix { inherit supportedSystems scrubJobs; };
 let
   nativePlatforms = all;
 
+  embedded = {
+    buildPackages.binutils = nativePlatforms;
+    buildPackages.gcc = nativePlatforms;
+    libcCross = nativePlatforms;
+  };
+
   common = {
     buildPackages.binutils = nativePlatforms;
     gmp = nativePlatforms;
@@ -134,6 +140,13 @@ in
   android64 = mapTestOnCross lib.systems.examples.aarch64-android-prebuilt (linuxCommon // {
   });
 
+  avr = mapTestOnCross lib.systems.examples.avr embedded;
+  arm-embedded = mapTestOnCross lib.systems.examples.arm-embedded embedded;
+  powerpc-embedded = mapTestOnCross lib.systems.examples.powerpc-embedded embedded;
+  aarch64-embedded = mapTestOnCross lib.systems.examples.aarch64-embedded embedded;
+  i686-embedded = mapTestOnCross lib.systems.examples.i686-embedded embedded;
+  x86_64-embedded = mapTestOnCross lib.systems.examples.x86_64-embedded embedded;
+
   /* Cross-built bootstrap tools for every supported platform */
   bootstrapTools = let
     tools = import ../stdenv/linux/make-bootstrap-tools-cross.nix { system = "x86_64-linux"; };