zsh profile load tweaking only on nixos

svn path=/nixpkgs/trunk/; revision=31149

pkgs/shells/zsh/default.nix

@@ -31,6 +31,7 @@ stdenv.mkDerivation {
     tar xf ${documentation} -C $out/share
     ensureDir $out/etc/
     cat > $out/etc/zprofile <<EOF
+if test -e /etc/NIXOS; then
   if test -r /etc/zprofile; then
     . /etc/zprofile
   else
@@ -43,6 +44,13 @@ fi
   if test -r /etc/zprofile.local; then
     . /etc/zprofile.local
   fi
+else
+  # on non-nixos we just source the global /etc/zprofile as if we did
+  # not use the configure flag
+  if test -r /etc/zprofile; then
+    . /etc/zprofile
+  fi
+fi
 EOF
     $out/bin/zsh -c "zcompile $out/etc/zprofile"
     mv $out/etc/zprofile $out/etc/zprofile_zwc_is_used