* Move the substitution functions into stdenv (not merged yet).

* If the environment variable buildCommand is set, then eval that
  instead of doing the build phases.  This is used by the runCommand
  function in all-packages.nix to allow one-lines like

    foo = runCommand "foo" {} "mkdir $out; echo foo > $out/foo";
    

svn path=/nixpkgs/trunk/; revision=7298

pkgs/build-support/substitute/substitute-all.nix

@@ -0,0 +1,9 @@
+{stdenv}:
+
+args:
+
+stdenv.mkDerivation ({
+  name = if args ? name then args.name else baseNameOf (toString args.src);
+  builder = ./substitute-all.sh;
+  inherit (args) src;
+} // args)