darwin: fix assorted xcbuild builds

This includes adding a new xcbuild-based libutil build to test the waters a bit there.
We'll need to get xcbuild into the stdenv bootstrap before we can make the main build,
but it's nice to see that it can work.

pkgs/os-specific/darwin/apple-source-releases/file_cmds/default.nix

@@ -1,7 +1,7 @@
-{ stdenv, appleDerivation, xcbuild, zlib, bzip2, lzma }:
+{ stdenv, appleDerivation, xcbuild, zlib, bzip2, lzma, ncurses, libutil-new }:
 
 appleDerivation rec {
-  buildInputs = [ xcbuild zlib bzip2 lzma ];
+  buildInputs = [ xcbuild zlib bzip2 lzma ncurses libutil-new ];
 
   # some commands not working:
   # mtree: _simple.h not found
@@ -11,14 +11,15 @@ appleDerivation rec {
     substituteInPlace file_cmds.xcodeproj/project.pbxproj \
       --replace "FC8A8CAA14B655FD001B97AD /* PBXTargetDependency */," "" \
       --replace "FC8A8C9C14B655FD001B97AD /* PBXTargetDependency */," "" \
-      --replace "productName = file_cmds;" ""
+      --replace "productName = file_cmds;" "" \
+      --replace '/usr/lib/libcurses.dylib' 'libncurses.dylib'
     sed -i -re "s/name = ([a-zA-Z]+);/name = \1; productName = \1;/" file_cmds.xcodeproj/project.pbxproj
   '';
 
   # temporary install phase until xcodebuild has "install" support
   installPhase = ''
     mkdir -p $out/bin/
-    install file_cmds-*/Build/Products/Release/* $out/bin/
+    install file_cmds-*/Build/Products/Release/* $out/bin
 
     for n in 1; do
       mkdir -p $out/share/man/man$n