[Nix-dev] fix for mlton

[Marc Weber]

diff --git a/pkgs/development/compilers/mlton/default.nix b/pkgs/development/compilers/mlton/default.nix
index c7217f8..8b42e70 100644
--- a/pkgs/development/compilers/mlton/default.nix
+++ b/pkgs/development/compilers/mlton/default.nix
@@ -30,9 +30,7 @@ stdenv.mkDerivation rec {
 
   configurePhase = ''
     # Fix paths in the source.
-    for f in $(find $(pwd) -type f ) ; do
-      substituteInPlace $f --replace '/usr/bin/env bash' $(type -p bash)
-    done
+    find . -type f | grep -v -e '\.tgz''$' | xargs sed -i "s@/usr/bin/env bash@$(type -p bash)@"
 
     substituteInPlace $(pwd)/Makefile --replace '/bin/cp' $(type -p cp)
 
replacing the for each execute loop by sed also makes it a lot faster.
The probblem was  substituteInPlace modifying the .tgz file. Don't ask
me why it didn't happen in the past?

Either find or substituteInPlace changed behaviour !?

Marc Weber