Sawfish (git): New Package

Sawfish is a versatile, Lisp-based window manager

In that commit I include all Sawfish stack:
- librep, a lisp system;
- rep-gtk, bindings for gtk
- sawfish, the window manager

pkgs/development/libraries/rep-gtk/default.nix

@@ -0,0 +1,27 @@
+{ stdenv, fetchgit, pkgconfig, autoreconfHook, librep, gtk2 }:
+
+with stdenv.lib;
+stdenv.mkDerivation rec {
+
+  name = "rep-gtk-git-2015-02-15";
+
+  src = fetchgit {
+    url = "https://github.com/SawfishWM/rep-gtk.git";
+    rev = "74ac3504f2bbbcc9ded005ab97cbf94cdc47924d";
+    sha256 = "edb47c5b6d09201d16a8f0616d18690ff0a37dca56d31c6e635b286bd0b6a031";
+  };
+
+  buildInputs = [ pkgconfig autoreconfHook ];
+  propagatedBuildInputs = [ librep gtk2 ];
+
+  patchPhase = ''
+    sed -e 's|installdir=$(repexecdir)|installdir=$(libdir)/rep|g' -i Makefile.in
+  '';
+
+  meta = {
+    description = "GTK+ bindings for librep";
+    homepage = http://sawfish.wikia.com;
+    license = licenses.gpl2;
+    maintainers = [ maintainers.AndersonTorres ];
+  };
+}

pkgs/development/libraries/rep-gtk/setup-hook.sh

@@ -0,0 +1,5 @@
+addRepDLLoadPath () {
+    addToSearchPath REP_DL_LOAD_PATH $1/lib/rep
+}
+
+envHooks+=(addRepDLLoadPath)