treewide: cmake buildInputs to nativeBuildInputs, minor cleanups

pkgs/applications/graphics/screencloud/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
   # for tracking usage.
   consumerKey = "23e747012c68601f27ab69c6de129ed70552d55b6";
   consumerSecret = "4701cb00c1bd357bbcae7c3d713dd216";
-  
+
   src = fetchFromGitHub {
     owner = "olav-st";
     repo = "screencloud";
@@ -17,7 +17,8 @@ stdenv.mkDerivation rec {
     sha256 = "1s0dxa1sa37nvna5nfqdsp294810favj68qb7ghl78qna7zw0cim";
   };
 
-  buildInputs = [ cmake qt4 quazip qt-mobility qxt pythonPackages.python pythonPackages.pycrypto ];
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ qt4 quazip qt-mobility qxt pythonPackages.python pythonPackages.pycrypto ];
 
   patchPhase = ''
     # Required to make the configure script work. Normally, screencloud's
@@ -28,8 +29,6 @@ stdenv.mkDerivation rec {
     substituteInPlace "CMakeLists.txt" --replace "set(CMAKE_INSTALL_PREFIX \"/opt\")" ""
   '';
 
-  enableParallelBuilding = true;
-
   # We need to append /opt to our CMAKE_INSTALL_PREFIX, so we tell the Nix not
   # to add the argument for us.
   dontAddPrefix = true;