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/librep/default.nix

@@ -0,0 +1,42 @@
+
+	{ stdenv, fetchgit
+, pkgconfig, autoreconfHook
+, readline, texinfo
+, gdbm, gmp, libffi }:
+
+with stdenv.lib;
+stdenv.mkDerivation rec {
+
+  name = "librep-git-2015-02-15";
+
+  src = fetchgit {
+    url = "https://github.com/SawfishWM/librep.git";
+    rev = "a1f2db721aa5055e90f6a76fde625946340ed8cf";
+    sha256 = "c91484d02b2408becc8961997c3d6404aefa8e1f8af4621a8b5f7622b1857fa6";
+  };
+
+  buildInputs = [ pkgconfig autoreconfHook readline texinfo ];
+  propagatedBuildInputs = [ gdbm gmp libffi ];
+
+  configureFlags = [
+    "--disable-static"
+  ];
+
+  setupHook = ./setup-hook.sh;
+
+  meta = {
+    description = "Lisp system for Sawfish";
+    longDescription = ''
+      This is librep, a Lisp system for UNIX, needed by Sawfish window manager.
+      It contains a Lisp interpreter, byte-code compiler and virtual machine.
+      Applications may use the Lisp interpreter as an extension language,
+      or it may be used for stand-alone scripts.
+
+      The Lisp dialect was originally inspired by Emacs Lisp, but with the worst
+      features removed. It also borrows many ideas from Scheme.
+    '';
+    homepage = http://sawfish.wikia.com;
+    license = licenses.gpl2;
+    maintainers = [ maintainers.AndersonTorres ];
+  };
+}

pkgs/development/libraries/librep/setup-hook.sh

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