* "sed -i" isn't very portable, so don't use it here.

svn path=/nixpkgs/branches/stdenv-updates/; revision=31705

pkgs/stdenv/generic/builder.sh

@@ -9,10 +9,11 @@ mkdir $out
 echo "$preHook" > $out/setup
 cat "$setup" >> $out/setup
 
-sed -i "$out/setup" \
-    -e "s^@initialPath@^$initialPath^g" \
+sed -e "s^@initialPath@^$initialPath^g" \
     -e "s^@gcc@^$gcc^g" \
-    -e "s^@shell@^$shell^g"
+    -e "s^@shell@^$shell^g" \
+    < $out/setup > $out/setup.tmp
+mv $out/setup.tmp $out/setup
 
 # Allow the user to install stdenv using nix-env and get the packages
 # in stdenv.