* "ensureDir" -> "mkdir -p". "ensureDir" is a rather pointless

function, so obsolete it.

svn path=/nixpkgs/branches/stdenv-updates/; revision=31644

pkgs/applications/science/logic/isabelle/default.nix

@@ -41,7 +41,7 @@ stdenv.mkDerivation {
   '';
 
   installPhase = ''
-    ensureDir $out/bin
+    mkdir -p $out/bin
     mv $TMP/$name $out
     cd $out/$name
     bin/isabelle install -p $out/bin