Added XScreensaver; also changed version-stub.nix (now it does sumArgs itself, and requires builderDefs to be used) and added a merge of composing-builder and declarative flag processing.

svn path=/nixpkgs/branches/stdenv-updates/; revision=9880

pkgs/applications/graphics/xscreensaver/5.04.nix

@@ -0,0 +1,38 @@
+args : with args; with builderDefs (args // {
+		src = /* put a fetchurl here */
+		fetchurl {
+			url = http://www.jwz.org/xscreensaver/xscreensaver-5.04.tar.gz;
+			sha256 = "1mx6zc6rvb6pr9wb6mv4ljiii9ybw0dshd74aclf7rlmfx4hn86i";
+		};
+		useConfig = true;
+		reqsList = [
+			["true" "libX11" "gtk" "pkgconfig" "bc" "perl" "intltool" "libXmu"]
+			["GL" "mesa"]
+			["GUI" "gtk" "libxml2" "libglade"]
+			["jpeg" "libjpeg"]
+			["false"]
+		];
+		configFlags = [
+			"GL" " --with-gl "
+			"gdkpixbuf" " --with-pixbuf "
+			"DPMS" " --with-dpms "
+			"true" (" --with-x-app-defaults=\$out/share/xscreensaver/app-defaults "+
+				" --with-hackdir=\$out/share/xscreensaver-hacks ")
+		];
+	}) null; /* null is a terminator for sumArgs */
+let 
+	preConfigure = FullDepEntry ("
+		sed -e 's%@GTK_DATADIR@%@datadir@% ; s%@PO_DATADIR@%@datadir@%' "+
+		"-i driver/Makefile.in po/Makefile.in.in;
+	") [minInit doUnpack];
+in
+stdenv.mkDerivation rec {
+	name = "xscreensaver-"+version;
+	builder = writeScript (name + "-builder")
+		(textClosure [preConfigure doConfigure doMakeInstall doForceShare doPropagate]);
+	meta = {
+		description = "
+	The X screensaver daemon. Run xscreensaver-demo to configure.
+";
+	};
+}

pkgs/applications/graphics/xscreensaver/default.nix

@@ -0,0 +1,9 @@
+let
+    realPath=y: (__toPath ((toString ./JustNothing/.. )+"/"+y.version+".nix"));
+    dispatch=(x: ((import (realPath x)) x)); 
+in
+args : 
+with args; 
+with builderDefs {src="";} null;  
+let eater=(lib.sumArgs dispatch args); in
+eater