diff --git a/pkgs/build-support/bintools-wrapper/default.nix b/pkgs/build-support/bintools-wrapper/default.nix
index ccd342eaa0d1..dd6032fc52cf 100644
--- a/pkgs/build-support/bintools-wrapper/default.nix
+++ b/pkgs/build-support/bintools-wrapper/default.nix
@@ -301,12 +301,6 @@ stdenv.mkDerivation {
       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
-    ''
-
     + optionalString stdenv.targetPlatform.isDarwin ''
       echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/libc-ldflags
     ''
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index 8ac11436c5f7..539c29a0a774 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -649,12 +649,6 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" stackprotector"
     ''
 
-    + 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-crt1-cflags
-      done
-    ''
-
     + optionalString stdenv.targetPlatform.isDarwin ''
         echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/cc-cflags
     ''
diff --git a/pkgs/development/misc/avr/libc/default.nix b/pkgs/development/misc/avr/libc/default.nix
index ac9da31fcc0f..d7e9f0efe999 100644
--- a/pkgs/development/misc/avr/libc/default.nix
+++ b/pkgs/development/misc/avr/libc/default.nix
@@ -15,8 +15,11 @@ stdenv.mkDerivation rec {
   stripDebugList = [ "bin" ];
   dontPatchELF = true;
 
+  enableParallelBuilding = true;
+
   passthru = {
     incdir = "/avr/include";
+    libdir = "/avr/lib";
   };
 
   meta = with lib; {