Add an expression for Darwin's install_name_tool utility, which is required by several other builds.

svn path=/nixpkgs/trunk/; revision=26509

pkgs/os-specific/darwin/install_name_tool/builder.sh

@@ -0,0 +1,3 @@
+source $stdenv/setup
+mkdir -p "$out/bin"
+ln -s /usr/bin/install_name_tool "$out/bin/"

pkgs/os-specific/darwin/install_name_tool/default.nix

@@ -0,0 +1,8 @@
+{stdenv}:
+
+assert stdenv.isDarwin;
+
+stdenv.mkDerivation {
+  name = "darwin-install_name_tool-utility";
+  builder = ./builder.sh;
+}

pkgs/top-level/all-packages.nix

@@ -4660,6 +4660,8 @@ let
 
   darwinLipoUtility = callPackage ../os-specific/darwin/lipo { };
 
+  darwinInstallNameToolUtility = callPackage ../os-specific/darwin/install_name_tool { };
+
   devicemapper = lvm2;
 
   dmidecode = callPackage ../os-specific/linux/dmidecode { };