GNU MIG: When cross-compiling, patch shebang correctly.

svn path=/nixpkgs/trunk/; revision=33123

pkgs/os-specific/gnu/mig/default.nix

@@ -1,4 +1,4 @@
-{ fetchgit, stdenv, autoconf, automake, flex, bison, machHeaders }:
+{ fetchgit, stdenv, autoconf, automake, flex, bison, machHeaders, bash }:
 
 let
   date = "20100512";
@@ -21,6 +21,14 @@ stdenv.mkDerivation {
 
   doCheck = true;
 
+  crossAttrs = {
+    postInstall =
+      # Fix the shebang to point to the cross-built shell.
+      '' sed -i "$out/bin/mig" \
+             -e 's|^#!/.*|#!${bash.hostDrv}/bin/sh|g'
+      '';
+  };
+
   meta = {
     description = "GNU MIG, the Mach interface generator";