xmonad: cleanup wrapper

pkgs/applications/window-managers/xmonad/wrapper.nix

@@ -1,22 +1,16 @@
-{ stdenv, buildEnv, ghcWithPackages, xmessage, makeWrapper, packages }:
+{ stdenv, ghcWithPackages, xmessage, makeWrapper, packages }:
 
 let
 xmonadEnv = ghcWithPackages (self: [ self.xmonad ] ++ packages self);
-drv = buildEnv {
+in stdenv.mkDerivation {
   name = "xmonad-with-packages";
 
-  paths = [ xmonadEnv ];
+  nativeBuildInputs = [ makeWrapper ];
 
-  postBuild = ''
-    # TODO: This could be avoided if buildEnv could be forced to create all directories
-    rm $out/bin
-    mkdir $out/bin
-    for i in ${xmonadEnv}/bin/*; do
-      ln -s $i $out/bin
-    done
-    wrapProgram $out/bin/xmonad \
-      --set XMONAD_GHC "${xmonadEnv}/bin/ghc" \
+  buildCommand = ''
+    mkdir -p $out/bin
+    makeWrapper ${xmonadEnv}/bin/xmonad $out/bin/xmonad \
+      --set NIX_GHC "${xmonadEnv}/bin/ghc" \
       --set XMONAD_XMESSAGE "${xmessage}/bin/xmessage"
   '';
-  };
-in stdenv.lib.overrideDerivation drv (x : { buildInputs = x.buildInputs ++ [ makeWrapper ]; })
+}

pkgs/development/haskell-modules/xmonad-nix.patch

@@ -12,7 +12,7 @@
          err  = base ++ ".errors"
          src  = base ++ ".hs"
          lib  = dir </> "lib"
-+    ghc <- fromMaybe "ghc" <$> liftIO (lookupEnv "XMONAD_GHC")
++    ghc <- fromMaybe "ghc" <$> liftIO (lookupEnv "NIX_GHC")
      libTs <- mapM getModTime . Prelude.filter isSource =<< allFiles lib
      srcT <- getModTime src
      binT <- getModTime bin