move pure stdenv into a new directory, bring back the old one

remove __impure from non-darwin OSes

pkgs/stdenv/darwin/default.nix

@@ -4,294 +4,144 @@
 , config      ? {}
 }:
 
-let
+rec {
-  fetch = { file, sha256 }: import <nix/fetchurl.nix> {
-    url = "https://dl.dropboxusercontent.com/u/2857322/${file}";
-    inherit sha256;
-    executable = true;
-  };
-
-  bootstrapFiles = {
-    sh    = fetch { file = "sh";    sha256 = "1qakpg37vl61jnkplz13m3g1csqr85cg8ybp6jwiv6apmg26isnm"; };
-    bzip2 = fetch { file = "bzip2"; sha256 = "1gxa67255q9v00j1vn1mzyrnbwys2g1102cx02vpcyvvrl4vqxr0"; };
-    mkdir = fetch { file = "mkdir"; sha256 = "1yfl8w65ksji7fggrbvqxw8lp0gm02qilk11n9axj2jxay53ngvg"; };
-    cpio  = fetch { file = "cpio";  sha256 = "0nssyg19smgcblwq1mfcw4djbd85md84d2f093qcqkbigdjg484b"; };
-  };
-  tarball = fetch { file = "bootstrap-tools.9.cpio.bz2"; sha256 = "0fd79k7gy3z3sba5w4f4lnrcpiwff31vw02480x1pdry8bbgbf2j"; };
-in rec {
   allPackages = import ../../top-level/all-packages.nix;
 
-  commonPreHook = ''
+  bootstrapTools = derivation {
-    export NIX_ENFORCE_PURITY=1
+    inherit system;
-    export NIX_IGNORE_LD_THROUGH_GCC=1
-    stripAllFlags=" " # the Darwin "strip" command doesn't know "-s"
-    export MACOSX_DEPLOYMENT_TARGET=10.7
-    export SDKROOT=
-    export CMAKE_OSX_ARCHITECTURES=x86_64
-  '';
 
-  # libSystem and its transitive dependencies. Get used to this; it's a recurring theme in darwin land
+    name    = "trivial-bootstrap-tools";
-  libSystemClosure = [
+    builder = "/bin/sh";
-    "/usr/lib/libSystem.dylib"
+    args    = [ ./trivial-bootstrap.sh ];
-    "/usr/lib/libSystem.B.dylib"
-    "/usr/lib/libobjc.A.dylib"
-    "/usr/lib/libobjc.dylib"
-    "/usr/lib/libauto.dylib"
-    "/usr/lib/libc++abi.dylib"
-    "/usr/lib/libc++.1.dylib"
-    "/usr/lib/libDiagnosticMessagesClient.dylib"
-    "/usr/lib/system"
-  ];
 
-  # The one dependency of /bin/sh :(
+    mkdir   = "/bin/mkdir";
-  binShClosure = [ "/usr/lib/libncurses.5.4.dylib" ];
+    ln      = "/bin/ln";
-
-  bootstrapTools = derivation rec {
-    inherit system tarball;
-
-    name    = "bootstrap-tools";
-    builder = bootstrapFiles.sh; # Not a filename! Attribute 'sh' on bootstrapFiles
-    args    = [ ./unpack-bootstrap-tools.sh ];
-
-    inherit (bootstrapFiles) mkdir bzip2 cpio;
-
-    __impureHostDeps  = binShClosure ++ libSystemClosure;
   };
 
-  stageFun = step: last: {shell             ? "${bootstrapTools}/bin/sh",
+  # The simplest stdenv possible to run fetchadc and get the Apple command-line tools
-                          overrides         ? (pkgs: {}),
+  stage0 = rec {
-                          extraPreHook      ? "",
+    fetchurl = import ../../build-support/fetchurl {
-                          extraBuildInputs  ? with last.pkgs; [ xz darwin.CF libcxx ],
+      inherit stdenv;
-                          extraInitialPath  ? [],
-                          allowedRequisites ? null}:
-    let
-      thisStdenv = import ../generic {
-        inherit system config shell extraBuildInputs allowedRequisites;
-
-        name = "stdenv-darwin-boot-${toString step}";
-
-        cc = if isNull last then "/no-such-path" else import ../../build-support/cc-wrapper {
-          inherit shell;
-          inherit (last) stdenv;
-          inherit (last.pkgs.darwin) dyld;
-
-          nativeTools  = true;
-          nativePrefix = bootstrapTools;
-          nativeLibc   = false;
-          libc         = last.pkgs.darwin.Libsystem;
-          cc           = { name = "clang-9.9.9"; outPath = bootstrapTools; };
-        };
-
-        preHook = stage0.stdenv.lib.optionalString (shell == "${bootstrapTools}/bin/sh") ''
-          # Don't patch #!/interpreter because it leads to retained
-          # dependencies on the bootstrapTools in the final stdenv.
-          dontPatchShebangs=1
-        '' + ''
-          ${commonPreHook}
-          ${extraPreHook}
-        '';
-        initialPath  = extraInitialPath ++ [ bootstrapTools ];
-        fetchurlBoot = import ../../build-support/fetchurl {
-          stdenv = stage0.stdenv;
       curl = bootstrapTools;
     };
 
-        # The stdenvs themselves don't use mkDerivation, so I need to specify this here
+    stdenv = import ../generic {
-        __stdenvImpureHostDeps = binShClosure ++ libSystemClosure;
+      inherit system config;
-        __extraImpureHostDeps  = binShClosure ++ libSystemClosure;
+      name         = "stdenv-darwin-boot-0";
-
+      shell        = "/bin/bash";
-        extraAttrs = { inherit platform; };
+      initialPath  = [ bootstrapTools ];
-        overrides  = pkgs: (overrides pkgs) // { fetchurl = thisStdenv.fetchurlBoot; };
+      fetchurlBoot = fetchurl;
+      cc           = "/no-such-path";
+    };
   };
 
-      thisPkgs = allPackages {
+  buildTools = import ../../os-specific/darwin/command-line-tools {
+    inherit (stage0) stdenv fetchurl;
+    xar  = bootstrapTools;
+    gzip = bootstrapTools;
+    cpio = bootstrapTools;
+  };
+
+  preHook = ''
+    export NIX_IGNORE_LD_THROUGH_GCC=1
+    export NIX_DONT_SET_RPATH=1
+    export NIX_NO_SELF_RPATH=1
+    dontFixLibtool=1
+    stripAllFlags=" " # the Darwin "strip" command doesn't know "-s"
+    xargsFlags=" "
+    export MACOSX_DEPLOYMENT_TARGET=10.7
+    # Use the 10.9 SDK if we're running on 10.9, and 10.10 if we're
+    # running on 10.10. We need to use the 10.10 headers for functions
+    # like readlinkat() that are dynamically detected by configure
+    # scripts. Very impure, obviously.
+    export SDKROOT=$(/usr/bin/xcrun --sdk macosx"$(/usr/bin/sw_vers -productVersion | /usr/bin/cut -d. -f1,2)" --show-sdk-path 2> /dev/null || echo /)
+    export NIX_CFLAGS_COMPILE+=" --sysroot=/var/empty -idirafter $SDKROOT/usr/include -F$SDKROOT/System/Library/Frameworks -Wno-multichar -Wno-deprecated-declarations"
+    export NIX_LDFLAGS_AFTER+=" -L$SDKROOT/usr/lib"
+    export CMAKE_OSX_ARCHITECTURES=x86_64
+  '';
+
+  # A stdenv that wraps the Apple command-line tools and our other trivial symlinked bootstrap tools
+  stage1 = rec {
+    nativePrefix = "${buildTools.tools}/Library/Developer/CommandLineTools/usr";
+
+    stdenv = import ../generic {
+      name = "stdenv-darwin-boot-1";
+
+      inherit system config;
+      inherit (stage0.stdenv) shell fetchurlBoot;
+
+      initialPath = stage0.stdenv.initialPath ++ [ nativePrefix ];
+
+      preHook = preHook + "\n" + ''
+        export NIX_LDFLAGS_AFTER+=" -L/usr/lib"
+        export NIX_ENFORCE_PURITY=
+        export NIX_CFLAGS_COMPILE+=" -isystem ${nativePrefix}/include/c++/v1 -stdlib=libc++"
+        export NIX_CFLAGS_LINK+=" -stdlib=libc++ -Wl,-rpath,${nativePrefix}/lib"
+      '';
+
+      cc = import ../../build-support/cc-wrapper {
+        nativeTools  = true;
+        nativePrefix = nativePrefix;
+        nativeLibc   = true;
+        stdenv       = stage0.stdenv;
+        shell        = "/bin/bash";
+        cc           = {
+          name    = "clang-9.9.9";
+          cc      = "/usr";
+          outPath = nativePrefix;
+        };
+        isClang      = true;
+      };
+    };
+    pkgs = allPackages {
       inherit system platform;
-        bootStdenv = thisStdenv;
+      bootStdenv = stdenv;
-      };
-    in { stdenv = thisStdenv; pkgs = thisPkgs; };
-
-  stage0 = stageFun 0 null {
-    overrides = orig: with stage0; rec {
-      darwin = orig.darwin // {
-        Libsystem = stdenv.mkDerivation {
-          name = "bootstrap-Libsystem";
-          buildCommand = ''
-            mkdir -p $out
-            ln -s ${bootstrapTools}/lib $out/lib
-            ln -s ${bootstrapTools}/include-Libsystem $out/include
-          '';
-        };
-        dyld = bootstrapTools;
-      };
-
-      libcxx = stdenv.mkDerivation {
-        name = "bootstrap-libcxx";
-        phases = [ "installPhase" "fixupPhase" ];
-        installPhase = ''
-          mkdir -p $out/lib $out/include
-          ln -s ${bootstrapTools}/lib/libc++.dylib $out/lib/libc++.dylib
-          ln -s ${bootstrapTools}/include/c++      $out/include/c++
-        '';
-        setupHook = ../../development/compilers/llvm/3.5/libc++/setup-hook.sh;
-      };
-
-      libcxxabi = stdenv.mkDerivation {
-        name = "bootstrap-libcxxabi";
-        buildCommand = ''
-          mkdir -p $out/lib
-          ln -s ${bootstrapTools}/lib/libc++abi.dylib $out/lib/libc++abi.dylib
-        '';
-      };
-
-    };
-
-    extraBuildInputs = [];
-  };
-
-  persistent0 = _: {};
-
-  stage1 = with stage0; stageFun 1 stage0 {
-    extraPreHook = "export NIX_CFLAGS_COMPILE+=\" -F${bootstrapTools}/Library/Frameworks\"";
-    extraBuildInputs = [ pkgs.libcxx ];
-
-    allowedRequisites =
-      [ bootstrapTools ] ++ (with pkgs; [ libcxx libcxxabi ]) ++ [ pkgs.darwin.Libsystem ];
-
-    overrides = persistent0;
-  };
-
-  persistent1 = orig: with stage1.pkgs; {
-    inherit
-      zlib patchutils m4 scons flex perl bison unifdef unzip openssl icu python
-      libxml2 gettext sharutils gmp libarchive ncurses pkg-config libedit groff
-      openssh sqlite sed serf openldap db cyrus-sasl expat apr-util subversion xz
-      findfreetype libssh curl cmake autoconf automake libtool ed cpio coreutils;
-
-    darwin = orig.darwin // {
-      inherit (darwin)
-        dyld Libsystem xnu configd libdispatch libclosure launchd;
     };
   };
 
-  stage2 = with stage1; stageFun 2 stage1 {
+  stage2 = rec {
-    allowedRequisites =
+    stdenv = import ../generic {
-      [ bootstrapTools ] ++
+      name = "stdenv-darwin-boot-2";
-      (with pkgs; [ xz libcxx libcxxabi icu ]) ++
-      (with pkgs.darwin; [ dyld Libsystem CF ]);
 
-    overrides = persistent1;
+      inherit system config;
+      inherit (stage1.stdenv) shell fetchurlBoot preHook cc;
+
+      initialPath = [ stage1.pkgs.xz ] ++ stage1.stdenv.initialPath;
     };
-
+    pkgs = allPackages {
-  persistent2 = orig: with stage2.pkgs; {
+      inherit system platform;
-    inherit
+      bootStdenv = stdenv;
-      patchutils m4 scons flex perl bison unifdef unzip openssl python
-      gettext sharutils libarchive pkg-config groff bash subversion
-      openssh sqlite sed serf openldap db cyrus-sasl expat apr-util
-      findfreetype libssh curl cmake autoconf automake libtool cpio
-      libcxx libcxxabi;
-
-    darwin = orig.darwin // {
-      inherit (darwin)
-        dyld Libsystem xnu configd libdispatch libclosure launchd libiconv;
     };
   };
 
-  stage3 = with stage2; stageFun 3 stage2 {
+  # Use stage1 to build a whole set of actual tools so we don't have to rely on the Apple prebuilt ones or
-    shell = "${pkgs.bash}/bin/bash";
+  # the ugly symlinked bootstrap tools anymore.
+  stage3 = with stage2; import ../generic {
+    name = "stdenv-darwin-boot-3";
 
-    # We have a valid shell here (this one has no bootstrap-tools runtime deps) so stageFun
-    # enables patchShebangs above. Unfortunately, patchShebangs ignores our $SHELL setting
-    # and instead goes by $PATH, which happens to contain bootstrapTools. So it goes and
-    # patches our shebangs back to point at bootstrapTools. This makes sure bash comes first.
-    extraInitialPath = [ pkgs.bash ];
-
-    allowedRequisites =
-      [ bootstrapTools ] ++
-      (with pkgs; [ icu bash libcxx libcxxabi ]) ++
-      (with pkgs.darwin; [ dyld Libsystem ]);
-
-    overrides = persistent2;
-  };
-
-  persistent3 = orig: with stage3.pkgs; {
-    inherit
-      gnumake gzip gnused bzip2 gawk ed xz patch bash
-      libcxxabi libcxx ncurses libffi zlib llvm gmp pcre gnugrep
-      coreutils findutils diffutils patchutils;
-
-    llvmPackages = orig.llvmPackages // {
-      inherit (llvmPackages) llvm clang-unwrapped;
-    };
-
-    darwin = orig.darwin // {
-      inherit (darwin) dyld Libsystem libiconv;
-    };
-  };
-
-  stage4 = with stage3; stageFun 4 stage3 {
-    shell = "${pkgs.bash}/bin/bash";
-    extraInitialPath = [ pkgs.bash ];
-    overrides = persistent3;
-  };
-
-  persistent4 = orig: with stage4.pkgs; {
-    inherit
-      gnumake gzip gnused bzip2 gawk ed xz patch bash
-      libcxxabi libcxx ncurses libffi zlib icu llvm gmp pcre gnugrep
-      coreutils findutils diffutils patchutils binutils binutils-raw;
-
-    llvmPackages = orig.llvmPackages // {
-      inherit (llvmPackages) llvm clang-unwrapped;
-    };
-
-    darwin = orig.darwin // {
-      inherit (darwin) dyld Libsystem cctools CF libiconv;
-    };
-  };
-
-  stage5 = with stage4; import ../generic rec {
     inherit system config;
     inherit (stdenv) fetchurlBoot;
 
-    name = "stdenv-darwin";
+    initialPath = (import ../common-path.nix) { inherit pkgs; };
 
-    preHook = commonPreHook;
+    preHook = preHook + "\n" + ''
-
+      export NIX_ENFORCE_PURITY=1
-    __stdenvImpureHostDeps = binShClosure ++ libSystemClosure;
+    '';
-    __extraImpureHostDeps  = binShClosure ++ libSystemClosure;
-
-    initialPath = import ../common-path.nix { inherit pkgs; };
-    shell       = "${pkgs.bash}/bin/bash";
 
     cc = import ../../build-support/cc-wrapper {
-      inherit stdenv shell;
+      inherit stdenv;
       nativeTools   = false;
-      nativeLibc  = false;
+      nativeLibc    = true;
-      inherit (pkgs) coreutils binutils;
+      binutils      = pkgs.darwin.cctools;
-      inherit (pkgs.darwin) dyld;
       cc            = pkgs.llvmPackages.clang-unwrapped;
-      libc = pkgs.darwin.Libsystem;
+      coreutils     = pkgs.coreutils;
+      shell         = "${pkgs.bash}/bin/bash";
+      extraPackages = [ pkgs.libcxx ];
+      isClang       = true;
     };
 
-    extraBuildInputs = with pkgs; [ darwin.CF libcxx ];
+    shell = "${pkgs.bash}/bin/bash";
-
-    extraAttrs = {
-      inherit platform bootstrapTools;
-      libc         = pkgs.darwin.Libsystem;
-      shellPackage = pkgs.bash;
   };
 
-    allowedRequisites = (with pkgs; [
+  stdenvDarwin = stage3;
-      xz libcxx libcxxabi icu gmp gnumake findutils bzip2 llvm zlib libffi
-      coreutils ed diffutils gnutar gzip ncurses gnused bash gawk
-      gnugrep llvmPackages.clang-unwrapped patch pcre binutils-raw binutils gettext
-    ]) ++ (with pkgs.darwin; [
-      dyld Libsystem CF cctools libiconv
-    ]);
-
-    overrides = orig: persistent4 orig // {
-      clang = cc;
-      inherit cc;
-    };
-  };
 }

pkgs/stdenv/darwin/make-bootstrap-tools.nix

@@ -63,15 +63,13 @@ rec {
 
       cp -d ${gnugrep.pcre}/lib/libpcre*.dylib $out/lib
       cp -d ${libiconv}/lib/libiconv*.dylib $out/lib
-      cp -d ${gettext}/lib/libintl*.dylib $out/lib
-      chmod +x $out/lib/libintl*.dylib
 
       # Copy what we need of clang
-      cp -d ${llvmPackages.clang-unwrapped}/bin/clang $out/bin
+      cp -d ${llvmPackages.clang}/bin/clang $out/bin
-      cp -d ${llvmPackages.clang-unwrapped}/bin/clang++ $out/bin
+      cp -d ${llvmPackages.clang}/bin/clang++ $out/bin
-      cp -d ${llvmPackages.clang-unwrapped}/bin/clang-3.6 $out/bin
+      cp -d ${llvmPackages.clang}/bin/clang-3.5 $out/bin
 
-      cp -rL ${llvmPackages.clang-unwrapped}/lib/clang $out/lib
+      cp -rL ${llvmPackages.clang}/lib/clang $out/lib
 
       cp -d ${libcxx}/lib/libc++*.dylib $out/lib
       cp -d ${libcxxabi}/lib/libc++abi*.dylib $out/lib

pkgs/stdenv/default.nix

@@ -37,7 +37,13 @@ rec {
   stdenvLinux = (import ./linux { inherit system allPackages platform config lib; }).stdenvLinux;
 
   # Darwin standard environment.
-  stdenvDarwin = (import ./darwin { inherit system allPackages platform config;}).stage5;
+  stdenvDarwin = (import ./darwin { inherit system allPackages platform config;}).stdenvDarwin;
+
+  # Pure Darwin standard environment. Allows building with the sandbox enabled. To use,
+  # you can add this to your nixpkgs config:
+  #
+  #   replaceStdenv = {pkgs}: pkgs.allStdenvs.stdenvDarwinPure
+  stdenvDarwinPure = (import ./pure-darwin { inherit system allPackages platform config;}).stage5;
 
   # Select the appropriate stdenv for the platform `system'.
   stdenv =

pkgs/stdenv/generic/default.nix

@@ -21,6 +21,8 @@ let
   whitelist = config.whitelistedLicenses or [];
   blacklist = config.blacklistedLicenses or [];
 
+  ifDarwin = attrs: if system == "x86_64-darwin" then attrs else {};
+
   onlyLicenses = list:
     lib.lists.all (license:
       let l = lib.licenses.${license.shortName or "BROKEN"} or false; in
@@ -132,7 +134,9 @@ let
       assert licenseAllowed attrs;
 
       lib.addPassthru (derivation (
-        (removeAttrs attrs ["meta" "passthru" "crossAttrs" "pos"])
+        (removeAttrs attrs
+          ["meta" "passthru" "crossAttrs" "pos"
+           "__impureHostDeps" "__propagatedImpureHostDeps"])
         // (let
           buildInputs = attrs.buildInputs or [];
           nativeBuildInputs = attrs.nativeBuildInputs or [];
@@ -161,14 +165,14 @@ let
           nativeBuildInputs = nativeBuildInputs ++ (if crossConfig == null then buildInputs else []);
           propagatedNativeBuildInputs = propagatedNativeBuildInputs ++
             (if crossConfig == null then propagatedBuildInputs else []);
-
+        } // ifDarwin {
           __impureHostDeps = computedImpureHostDeps ++ computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps ++ __impureHostDeps ++ __extraImpureHostDeps ++ [
             "/dev/zero"
             "/dev/random"
             "/dev/urandom"
             "/bin/sh"
           ];
-          __propagatedImpureHostDeps = lib.unique (lib.sort (x: y: x < y) (computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps));
+          __propagatedImpureHostDeps = computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps;
         }))) (
       {
         # The meta attribute is passed in the resulting attribute set,
@@ -193,7 +197,6 @@ let
     (if isNull allowedRequisites then {} else { allowedRequisites = allowedRequisites ++ defaultNativeBuildInputs; }) //
     {
       inherit system name;
-      __impureHostDeps = __stdenvImpureHostDeps;
 
       builder = shell;
 
@@ -202,6 +205,9 @@ let
       setup = setupScript;
 
       inherit preHook initialPath shell defaultNativeBuildInputs;
+    }
+    // ifDarwin {
+      __impureHostDeps = __stdenvImpureHostDeps;
     })
 
     // rec {

pkgs/stdenv/pure-darwin/default.nix

@@ -0,0 +1,297 @@
+{ system      ? builtins.currentSystem
+, allPackages ? import ../../top-level/all-packages.nix
+, platform    ? null
+, config      ? {}
+}:
+
+let
+  fetch = { file, sha256 }: import <nix/fetchurl.nix> {
+    url = "https://dl.dropboxusercontent.com/u/2857322/${file}";
+    inherit sha256;
+    executable = true;
+  };
+
+  bootstrapFiles = {
+    sh    = fetch { file = "sh";    sha256 = "1qakpg37vl61jnkplz13m3g1csqr85cg8ybp6jwiv6apmg26isnm"; };
+    bzip2 = fetch { file = "bzip2"; sha256 = "1gxa67255q9v00j1vn1mzyrnbwys2g1102cx02vpcyvvrl4vqxr0"; };
+    mkdir = fetch { file = "mkdir"; sha256 = "1yfl8w65ksji7fggrbvqxw8lp0gm02qilk11n9axj2jxay53ngvg"; };
+    cpio  = fetch { file = "cpio";  sha256 = "0nssyg19smgcblwq1mfcw4djbd85md84d2f093qcqkbigdjg484b"; };
+  };
+  tarball = fetch { file = "bootstrap-tools.9.cpio.bz2"; sha256 = "0fd79k7gy3z3sba5w4f4lnrcpiwff31vw02480x1pdry8bbgbf2j"; };
+in rec {
+  allPackages = import ../../top-level/all-packages.nix;
+
+  commonPreHook = ''
+    export NIX_ENFORCE_PURITY=1
+    export NIX_IGNORE_LD_THROUGH_GCC=1
+    stripAllFlags=" " # the Darwin "strip" command doesn't know "-s"
+    export MACOSX_DEPLOYMENT_TARGET=10.7
+    export SDKROOT=
+    export CMAKE_OSX_ARCHITECTURES=x86_64
+  '';
+
+  # libSystem and its transitive dependencies. Get used to this; it's a recurring theme in darwin land
+  libSystemClosure = [
+    "/usr/lib/libSystem.dylib"
+    "/usr/lib/libSystem.B.dylib"
+    "/usr/lib/libobjc.A.dylib"
+    "/usr/lib/libobjc.dylib"
+    "/usr/lib/libauto.dylib"
+    "/usr/lib/libc++abi.dylib"
+    "/usr/lib/libc++.1.dylib"
+    "/usr/lib/libDiagnosticMessagesClient.dylib"
+    "/usr/lib/system"
+  ];
+
+  # The one dependency of /bin/sh :(
+  binShClosure = [ "/usr/lib/libncurses.5.4.dylib" ];
+
+  bootstrapTools = derivation rec {
+    inherit system tarball;
+
+    name    = "bootstrap-tools";
+    builder = bootstrapFiles.sh; # Not a filename! Attribute 'sh' on bootstrapFiles
+    args    = [ ./unpack-bootstrap-tools.sh ];
+
+    inherit (bootstrapFiles) mkdir bzip2 cpio;
+
+    __impureHostDeps  = binShClosure ++ libSystemClosure;
+  };
+
+  stageFun = step: last: {shell             ? "${bootstrapTools}/bin/sh",
+                          overrides         ? (pkgs: {}),
+                          extraPreHook      ? "",
+                          extraBuildInputs  ? with last.pkgs; [ xz darwin.CF libcxx ],
+                          extraInitialPath  ? [],
+                          allowedRequisites ? null}:
+    let
+      thisStdenv = import ../generic {
+        inherit system config shell extraBuildInputs allowedRequisites;
+
+        name = "stdenv-darwin-boot-${toString step}";
+
+        cc = if isNull last then "/no-such-path" else import ../../build-support/cc-wrapper {
+          inherit shell;
+          inherit (last) stdenv;
+          inherit (last.pkgs.darwin) dyld;
+
+          nativeTools  = true;
+          nativePrefix = bootstrapTools;
+          nativeLibc   = false;
+          libc         = last.pkgs.darwin.Libsystem;
+          cc           = { name = "clang-9.9.9"; outPath = bootstrapTools; };
+        };
+
+        preHook = stage0.stdenv.lib.optionalString (shell == "${bootstrapTools}/bin/sh") ''
+          # Don't patch #!/interpreter because it leads to retained
+          # dependencies on the bootstrapTools in the final stdenv.
+          dontPatchShebangs=1
+        '' + ''
+          ${commonPreHook}
+          ${extraPreHook}
+        '';
+        initialPath  = extraInitialPath ++ [ bootstrapTools ];
+        fetchurlBoot = import ../../build-support/fetchurl {
+          stdenv = stage0.stdenv;
+          curl   = bootstrapTools;
+        };
+
+        # The stdenvs themselves don't use mkDerivation, so I need to specify this here
+        __stdenvImpureHostDeps = binShClosure ++ libSystemClosure;
+        __extraImpureHostDeps  = binShClosure ++ libSystemClosure;
+
+        extraAttrs = { inherit platform; };
+        overrides  = pkgs: (overrides pkgs) // { fetchurl = thisStdenv.fetchurlBoot; };
+      };
+
+      thisPkgs = allPackages {
+        inherit system platform;
+        bootStdenv = thisStdenv;
+      };
+    in { stdenv = thisStdenv; pkgs = thisPkgs; };
+
+  stage0 = stageFun 0 null {
+    overrides = orig: with stage0; rec {
+      darwin = orig.darwin // {
+        Libsystem = stdenv.mkDerivation {
+          name = "bootstrap-Libsystem";
+          buildCommand = ''
+            mkdir -p $out
+            ln -s ${bootstrapTools}/lib $out/lib
+            ln -s ${bootstrapTools}/include-Libsystem $out/include
+          '';
+        };
+        dyld = bootstrapTools;
+      };
+
+      libcxx = stdenv.mkDerivation {
+        name = "bootstrap-libcxx";
+        phases = [ "installPhase" "fixupPhase" ];
+        installPhase = ''
+          mkdir -p $out/lib $out/include
+          ln -s ${bootstrapTools}/lib/libc++.dylib $out/lib/libc++.dylib
+          ln -s ${bootstrapTools}/include/c++      $out/include/c++
+        '';
+        setupHook = ../../development/compilers/llvm/3.5/libc++/setup-hook.sh;
+      };
+
+      libcxxabi = stdenv.mkDerivation {
+        name = "bootstrap-libcxxabi";
+        buildCommand = ''
+          mkdir -p $out/lib
+          ln -s ${bootstrapTools}/lib/libc++abi.dylib $out/lib/libc++abi.dylib
+        '';
+      };
+
+    };
+
+    extraBuildInputs = [];
+  };
+
+  persistent0 = _: {};
+
+  stage1 = with stage0; stageFun 1 stage0 {
+    extraPreHook = "export NIX_CFLAGS_COMPILE+=\" -F${bootstrapTools}/Library/Frameworks\"";
+    extraBuildInputs = [ pkgs.libcxx ];
+
+    allowedRequisites =
+      [ bootstrapTools ] ++ (with pkgs; [ libcxx libcxxabi ]) ++ [ pkgs.darwin.Libsystem ];
+
+    overrides = persistent0;
+  };
+
+  persistent1 = orig: with stage1.pkgs; {
+    inherit
+      zlib patchutils m4 scons flex perl bison unifdef unzip openssl icu python
+      libxml2 gettext sharutils gmp libarchive ncurses pkg-config libedit groff
+      openssh sqlite sed serf openldap db cyrus-sasl expat apr-util subversion xz
+      findfreetype libssh curl cmake autoconf automake libtool ed cpio coreutils;
+
+    darwin = orig.darwin // {
+      inherit (darwin)
+        dyld Libsystem xnu configd libdispatch libclosure launchd;
+    };
+  };
+
+  stage2 = with stage1; stageFun 2 stage1 {
+    allowedRequisites =
+      [ bootstrapTools ] ++
+      (with pkgs; [ xz libcxx libcxxabi icu ]) ++
+      (with pkgs.darwin; [ dyld Libsystem CF ]);
+
+    overrides = persistent1;
+  };
+
+  persistent2 = orig: with stage2.pkgs; {
+    inherit
+      patchutils m4 scons flex perl bison unifdef unzip openssl python
+      gettext sharutils libarchive pkg-config groff bash subversion
+      openssh sqlite sed serf openldap db cyrus-sasl expat apr-util
+      findfreetype libssh curl cmake autoconf automake libtool cpio
+      libcxx libcxxabi;
+
+    darwin = orig.darwin // {
+      inherit (darwin)
+        dyld Libsystem xnu configd libdispatch libclosure launchd libiconv;
+    };
+  };
+
+  stage3 = with stage2; stageFun 3 stage2 {
+    shell = "${pkgs.bash}/bin/bash";
+
+    # We have a valid shell here (this one has no bootstrap-tools runtime deps) so stageFun
+    # enables patchShebangs above. Unfortunately, patchShebangs ignores our $SHELL setting
+    # and instead goes by $PATH, which happens to contain bootstrapTools. So it goes and
+    # patches our shebangs back to point at bootstrapTools. This makes sure bash comes first.
+    extraInitialPath = [ pkgs.bash ];
+
+    allowedRequisites =
+      [ bootstrapTools ] ++
+      (with pkgs; [ icu bash libcxx libcxxabi ]) ++
+      (with pkgs.darwin; [ dyld Libsystem ]);
+
+    overrides = persistent2;
+  };
+
+  persistent3 = orig: with stage3.pkgs; {
+    inherit
+      gnumake gzip gnused bzip2 gawk ed xz patch bash
+      libcxxabi libcxx ncurses libffi zlib llvm gmp pcre gnugrep
+      coreutils findutils diffutils patchutils;
+
+    llvmPackages = orig.llvmPackages // {
+      inherit (llvmPackages) llvm clang-unwrapped;
+    };
+
+    darwin = orig.darwin // {
+      inherit (darwin) dyld Libsystem libiconv;
+    };
+  };
+
+  stage4 = with stage3; stageFun 4 stage3 {
+    shell = "${pkgs.bash}/bin/bash";
+    extraInitialPath = [ pkgs.bash ];
+    overrides = persistent3;
+  };
+
+  persistent4 = orig: with stage4.pkgs; {
+    inherit
+      gnumake gzip gnused bzip2 gawk ed xz patch bash
+      libcxxabi libcxx ncurses libffi zlib icu llvm gmp pcre gnugrep
+      coreutils findutils diffutils patchutils binutils binutils-raw;
+
+    llvmPackages = orig.llvmPackages // {
+      inherit (llvmPackages) llvm clang-unwrapped;
+    };
+
+    darwin = orig.darwin // {
+      inherit (darwin) dyld Libsystem cctools CF libiconv;
+    };
+  };
+
+  stage5 = with stage4; import ../generic rec {
+    inherit system config;
+    inherit (stdenv) fetchurlBoot;
+
+    name = "stdenv-darwin";
+
+    preHook = commonPreHook;
+
+    __stdenvImpureHostDeps = binShClosure ++ libSystemClosure;
+    __extraImpureHostDeps  = binShClosure ++ libSystemClosure;
+
+    initialPath = import ../common-path.nix { inherit pkgs; };
+    shell       = "${pkgs.bash}/bin/bash";
+
+    cc = import ../../build-support/cc-wrapper {
+      inherit stdenv shell;
+      nativeTools = false;
+      nativeLibc  = false;
+      inherit (pkgs) coreutils binutils;
+      inherit (pkgs.darwin) dyld;
+      cc   = pkgs.llvmPackages.clang-unwrapped;
+      libc = pkgs.darwin.Libsystem;
+    };
+
+    extraBuildInputs = with pkgs; [ darwin.CF libcxx ];
+
+    extraAttrs = {
+      inherit platform bootstrapTools;
+      libc         = pkgs.darwin.Libsystem;
+      shellPackage = pkgs.bash;
+    };
+
+    allowedRequisites = (with pkgs; [
+      xz libcxx libcxxabi icu gmp gnumake findutils bzip2 llvm zlib libffi
+      coreutils ed diffutils gnutar gzip ncurses gnused bash gawk
+      gnugrep llvmPackages.clang-unwrapped patch pcre binutils-raw binutils gettext
+    ]) ++ (with pkgs.darwin; [
+      dyld Libsystem CF cctools libiconv
+    ]);
+
+    overrides = orig: persistent4 orig // {
+      clang = cc;
+      inherit cc;
+    };
+  };
+}

pkgs/stdenv/pure-darwin/make-bootstrap-tools.nix

@@ -0,0 +1,286 @@
+{system ? builtins.currentSystem}:
+
+with import ../../top-level/all-packages.nix {inherit system;};
+
+rec {
+  # We want coreutils without ACL support.
+  coreutils_ = coreutils.override (orig: {
+    aclSupport = false;
+  });
+
+  build = stdenv.mkDerivation {
+    name = "build";
+
+    buildInputs = [nukeReferences cpio];
+
+    buildCommand = ''
+      mkdir -p $out/bin $out/lib
+
+      # Our (fake) loader
+      cp -d ${darwin.dyld}/lib/dyld $out/lib/
+
+      # C standard library stuff
+      cp -d ${darwin.Libsystem}/lib/*.o $out/lib/
+      cp -d ${darwin.Libsystem}/lib/*.dylib $out/lib/
+      cp -d ${darwin.Libsystem}/lib/system/*.dylib $out/lib/
+
+      # Resolv is actually a link to another package, so let's copy it properly
+      rm $out/lib/libresolv.9.dylib
+      cp -L ${darwin.Libsystem}/lib/libresolv.9.dylib $out/lib
+
+      cp -rL ${darwin.Libsystem}/include $out
+      chmod -R u+w $out/include
+      cp -rL ${icu}/include*             $out/include
+      cp -rL ${libiconv}/include/*       $out/include
+      cp -rL ${gnugrep.pcre}/include/*   $out/include
+      mv $out/include $out/include-Libsystem
+
+      # Copy coreutils, bash, etc.
+      cp ${coreutils_}/bin/* $out/bin
+      (cd $out/bin && rm vdir dir sha*sum pinky factor pathchk runcon shuf who whoami shred users)
+
+      cp ${bash}/bin/bash $out/bin
+      cp ${findutils}/bin/find $out/bin
+      cp ${findutils}/bin/xargs $out/bin
+      cp -d ${diffutils}/bin/* $out/bin
+      cp -d ${gnused}/bin/* $out/bin
+      cp -d ${gnugrep}/bin/grep $out/bin
+      cp ${gawk}/bin/gawk $out/bin
+      cp -d ${gawk}/bin/awk $out/bin
+      cp ${gnutar}/bin/tar $out/bin
+      cp ${gzip}/bin/gzip $out/bin
+      cp ${bzip2}/bin/bzip2 $out/bin
+      cp -d ${gnumake}/bin/* $out/bin
+      cp -d ${patch}/bin/* $out/bin
+      cp -d ${xz}/bin/xz $out/bin
+
+      # This used to be in-nixpkgs, but now is in the bundle
+      # because I can't be bothered to make it partially static
+      cp ${curl}/bin/curl $out/bin
+      cp -d ${curl}/lib/libcurl*.dylib $out/lib
+      cp -d ${libssh2}/lib/libssh*.dylib $out/lib
+      cp -d ${openssl}/lib/*.dylib $out/lib
+
+      cp -d ${gnugrep.pcre}/lib/libpcre*.dylib $out/lib
+      cp -d ${libiconv}/lib/libiconv*.dylib $out/lib
+      cp -d ${gettext}/lib/libintl*.dylib $out/lib
+      chmod +x $out/lib/libintl*.dylib
+
+      # Copy what we need of clang
+      cp -d ${llvmPackages.clang-unwrapped}/bin/clang $out/bin
+      cp -d ${llvmPackages.clang-unwrapped}/bin/clang++ $out/bin
+      cp -d ${llvmPackages.clang-unwrapped}/bin/clang-3.6 $out/bin
+
+      cp -rL ${llvmPackages.clang-unwrapped}/lib/clang $out/lib
+
+      cp -d ${libcxx}/lib/libc++*.dylib $out/lib
+      cp -d ${libcxxabi}/lib/libc++abi*.dylib $out/lib
+
+      mkdir $out/include
+      cp -rd ${libcxx}/include/c++     $out/include
+
+      cp -d ${icu}/lib/libicu*.dylib $out/lib
+      cp -d ${zlib}/lib/libz.*       $out/lib
+      cp -d ${gmpxx}/lib/libgmp*.*   $out/lib
+      cp -d ${xz}/lib/liblzma*.*     $out/lib
+
+      # Copy binutils.
+      for i in as ld ar ranlib nm strip otool install_name_tool dsymutil; do
+        cp ${darwin.cctools}/bin/$i $out/bin
+      done
+
+      cp -rd ${pkgs.darwin.CF}/Library $out
+
+      chmod -R u+w $out
+
+      nuke-refs $out/bin/*
+
+      rpathify() {
+        local libs=$(${darwin.cctools}/bin/otool -L "$1" | tail -n +2 | grep -o "$NIX_STORE.*-\S*") || true
+        for lib in $libs; do
+          ${darwin.cctools}/bin/install_name_tool -change $lib "@rpath/$(basename $lib)" "$1"
+        done
+      }
+
+      fix_dyld() {
+        # This is clearly a hack. Once we have an install_name_tool-alike that can patch dyld, this will be nicer.
+        ${perl}/bin/perl -i -0777 -pe 's/\/nix\/store\/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-dyld-239\.4\/lib\/dyld/\/usr\/lib\/dyld\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00/sg' "$1"
+      }
+
+      # Strip executables even further
+      for i in $out/bin/*; do
+        if test -x $i -a ! -L $i; then
+          chmod +w $i
+
+          fix_dyld $i
+          strip $i || true
+        fi
+      done
+
+      for i in $out/bin/* $out/lib/*.dylib $out/lib/clang/3.5.0/lib/darwin/*.dylib $out/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation; do
+        if test -x $i -a ! -L $i; then
+          echo "Adding rpath to $i"
+          rpathify $i
+        fi
+      done
+
+      nuke-refs $out/lib/*
+      nuke-refs $out/lib/clang/3.5.0/lib/darwin/*
+      nuke-refs $out/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
+
+      mkdir $out/.pack
+      mv $out/* $out/.pack
+      mv $out/.pack $out/pack
+
+      mkdir $out/on-server
+      (cd $out/pack && (find | cpio -o -H newc)) | bzip2 > $out/on-server/bootstrap-tools.cpio.bz2
+
+      mkdir $out/in-nixpkgs
+      cp ${stdenv.shell} $out/in-nixpkgs/sh
+      cp ${cpio}/bin/cpio $out/in-nixpkgs
+      cp ${coreutils_}/bin/mkdir $out/in-nixpkgs
+      cp ${bzip2}/bin/bzip2 $out/in-nixpkgs
+
+      chmod u+w $out/in-nixpkgs/*
+      strip $out/in-nixpkgs/*
+      nuke-refs $out/in-nixpkgs/*
+
+      for i in $out/in-nixpkgs/*; do
+        fix_dyld $i
+      done
+    '';
+
+    allowedReferences = [];
+  };
+
+  host = stdenv.mkDerivation {
+    name = "host";
+
+    buildCommand = ''
+      mkdir -p $out/nix-support
+
+      for i in "${build}/on-server/"*; do
+        echo "file binary-dist $i" >> $out/nix-support/hydra-build-products
+      done
+
+      echo "darwin-bootstrap-tools-$(date +%Y.%m.%d)" >> $out/nix-support/hydra-release-name
+    '';
+
+    allowedReferences = [ build ];
+  };
+
+  unpack = stdenv.mkDerivation {
+    name = "unpack";
+
+    # This is by necessity a near-duplicate of unpack-bootstrap-tools.sh. If we refer to it directly,
+    # we can't make any changes to it due to our testing stdenv depending on it. Think of this as the
+    # unpack-bootstrap-tools.sh for the next round of bootstrap tools.
+    # TODO: think through alternate designs, such as hosting this script as an output of the process.
+    buildCommand = ''
+      # Unpack the bootstrap tools tarball.
+      echo Unpacking the bootstrap tools...
+      $mkdir $out
+      $bzip2 -d < $tarball | (cd $out && $cpio -i)
+
+      # Set the ELF interpreter / RPATH in the bootstrap binaries.
+      echo Patching the tools...
+
+      export PATH=$out/bin
+
+      for i in $out/bin/*; do
+        if ! test -L $i; then
+          echo patching $i
+          install_name_tool -add_rpath $out/lib $i || true
+        fi
+      done
+
+      for i in $out/lib/*.dylib $out/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation; do
+        if ! test -L $i; then
+          echo patching $i
+
+          id=$(otool -D "$i" | tail -n 1)
+          install_name_tool -id "$(dirname $i)/$(basename $id)" $i
+
+          libs=$(otool -L "$i" | tail -n +2 | grep -v Libsystem | cat)
+          if [ -n "$libs" ]; then
+            install_name_tool -add_rpath $out/lib $i
+          fi
+        fi
+      done
+
+      ln -s bash $out/bin/sh
+      ln -s bzip2 $out/bin/bunzip2
+
+      cat >$out/bin/dsymutil << EOF
+      #!$out/bin/sh
+      EOF
+    '';
+
+    tarball = "${build}/on-server/bootstrap-tools.cpio.bz2";
+
+    mkdir = "${build}/in-nixpkgs/mkdir";
+    bzip2 = "${build}/in-nixpkgs/bzip2";
+    cpio  = "${build}/in-nixpkgs/cpio";
+
+    allowedReferences = [ "out" ];
+  };
+
+  test = stdenv.mkDerivation {
+    name = "test";
+
+    realBuilder = "${unpack}/bin/bash";
+
+    buildCommand = ''
+      export PATH=${unpack}/bin
+      ls -l
+      mkdir $out
+      mkdir $out/bin
+      sed --version
+      find --version
+      diff --version
+      patch --version
+      make --version
+      awk --version
+      grep --version
+      clang --version
+      xz --version
+
+      # The grep will return a nonzero exit code if there is no match, and we want to assert that we have
+      # an SSL-capable curl
+      curl --version | grep SSL
+
+      ${build}/in-nixpkgs/sh -c 'echo Hello World'
+
+      export flags="-idirafter ${unpack}/include-Libsystem --sysroot=${unpack} -L${unpack}/lib"
+
+      export CPP="clang -E $flags"
+      export CC="clang $flags -Wl,-rpath,${unpack}/lib -Wl,-v"
+      export CXX="clang++ $flags --stdlib=libc++ -lc++abi -isystem${unpack}/include/c++/v1 -Wl,-rpath,${unpack}/lib -Wl,-v"
+
+      echo '#include <stdio.h>' >> foo.c
+      echo '#include <float.h>' >> foo.c
+      echo '#include <limits.h>' >> foo.c
+      echo 'int main() { printf("Hello World\n"); return 0; }' >> foo.c
+      $CC -o $out/bin/foo foo.c
+      $out/bin/foo
+
+      echo '#include <CoreFoundation/CoreFoundation.h>' >> bar.c
+      echo 'int main() { CFShow(CFSTR("Hullo")); return 0; }' >> bar.c
+      $CC -F${unpack}/Library/Frameworks -framework CoreFoundation -o $out/bin/bar bar.c
+      $out/bin/bar
+
+      echo '#include <iostream>' >> bar.cc
+      echo 'int main() { std::cout << "Hello World\n"; }' >> bar.cc
+      $CXX -v -o $out/bin/bar bar.cc
+      $out/bin/bar
+
+      tar xvf ${hello.src}
+      cd hello-*
+      ./configure --prefix=$out
+      make
+      make install
+
+      $out/bin/hello
+    '';
+  };
+}

pkgs/stdenv/pure-darwin/trivial-bootstrap.sh

@@ -0,0 +1,66 @@
+
+# Building bootstrap tools
+echo Building the trivial bootstrap environment...
+$mkdir -p $out/bin
+
+$ln -s $ln $out/bin/ln
+
+PATH=$out/bin/
+
+cd $out/bin
+
+ln -s $mkdir
+ln -s /bin/sh
+ln -s /bin/cp
+ln -s /bin/mv
+ln -s /bin/rm
+ln -s /bin/ls
+ln -s /bin/ps
+ln -s /bin/cat
+ln -s /bin/bash
+ln -s /bin/echo
+ln -s /bin/expr
+ln -s /bin/test
+ln -s /bin/date
+ln -s /bin/chmod
+ln -s /bin/rmdir
+ln -s /bin/sleep
+ln -s /bin/hostname
+
+ln -s /usr/bin/id
+ln -s /usr/bin/od
+ln -s /usr/bin/tr
+ln -s /usr/bin/wc
+ln -s /usr/bin/cut
+ln -s /usr/bin/cmp
+ln -s /usr/bin/sed
+ln -s /usr/bin/tar
+ln -s /usr/bin/xar
+ln -s /usr/bin/awk
+ln -s /usr/bin/env
+ln -s /usr/bin/tee
+ln -s /usr/bin/comm
+ln -s /usr/bin/cpio
+ln -s /usr/bin/curl
+ln -s /usr/bin/find
+ln -s /usr/bin/grep
+ln -s /usr/bin/gzip
+ln -s /usr/bin/head
+ln -s /usr/bin/tail
+ln -s /usr/bin/sort
+ln -s /usr/bin/uniq
+ln -s /usr/bin/less
+ln -s /usr/bin/true
+ln -s /usr/bin/diff
+ln -s /usr/bin/egrep
+ln -s /usr/bin/fgrep
+ln -s /usr/bin/patch
+ln -s /usr/bin/uname
+ln -s /usr/bin/touch
+ln -s /usr/bin/split
+ln -s /usr/bin/xargs
+ln -s /usr/bin/which
+ln -s /usr/bin/install
+ln -s /usr/bin/basename
+ln -s /usr/bin/dirname
+ln -s /usr/bin/readlink

pkgs/stdenv/pure-darwin/unpack-bootstrap-tools.sh

@@ -0,0 +1,54 @@
+set -e
+
+# Unpack the bootstrap tools tarball.
+echo Unpacking the bootstrap tools...
+$mkdir $out
+$bzip2 -d < $tarball | (cd $out && $cpio -i)
+
+# Set the ELF interpreter / RPATH in the bootstrap binaries.
+echo Patching the tools...
+
+export PATH=$out/bin
+
+for i in $out/bin/*; do
+  if ! test -L $i; then
+    echo patching $i
+    install_name_tool -add_rpath $out/lib $i || true
+  fi
+done
+
+for i in $out/lib/*.dylib $out/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation; do
+  if ! test -L $i; then
+    echo patching $i
+
+    id=$(otool -D "$i" | tail -n 1)
+    install_name_tool -id "$(dirname $i)/$(basename $id)" $i
+
+    libs=$(otool -L "$i" | tail -n +2 | grep -v libSystem | cat)
+    if [ -n "$libs" ]; then
+      install_name_tool -add_rpath $out/lib $i
+    fi
+  fi
+done
+
+ln -s bash $out/bin/sh
+ln -s bzip2 $out/bin/bunzip2
+
+# Provide a gunzip script.
+cat > $out/bin/gunzip <<EOF
+#!$out/bin/sh
+exec $out/bin/gzip -d "\$@"
+EOF
+chmod +x $out/bin/gunzip
+
+# Provide fgrep/egrep.
+echo "#! $out/bin/sh" > $out/bin/egrep
+echo "exec $out/bin/grep -E \"\$@\"" >> $out/bin/egrep
+echo "#! $out/bin/sh" > $out/bin/fgrep
+echo "exec $out/bin/grep -F \"\$@\"" >> $out/bin/fgrep
+
+cat >$out/bin/dsymutil << EOF
+#!$out/bin/sh
+EOF
+
+chmod +x $out/bin/egrep $out/bin/fgrep $out/bin/dsymutil