Adding the game Advanced Strategic Command.

I had to add an old version of libsigc++ for it.

svn path=/nixpkgs/trunk/; revision=23490

pkgs/development/libraries/libsigcxx/1.2.nix

@@ -0,0 +1,17 @@
+{stdenv, fetchurl, pkgconfig, m4}:
+
+stdenv.mkDerivation rec {
+  name = "libsigc++-1.2.7";
+  
+  src = fetchurl {
+    url = "http://ftp.gnome.org/pub/GNOME/sources/libsigc++/1.2/${name}.tar.bz2";
+    sha256 = "099224v5y0y1ggqrfc8vga8afr3nb93iicn7cj8xxgsrwa83s5nr";
+  };
+
+  buildInputs = [pkgconfig m4];
+
+  meta = {
+    homepage = http://libsigc.sourceforge.net/;
+    description = "A typesafe callback system for standard C++";
+  };
+}