xavs: add package

pkgs/development/libraries/xavs/default.nix

···
+{ stdenv, fetchsvn }:
+
+stdenv.mkDerivation rec {
+  name = "xavs-${version}";
+  version = "55";
+
+  src = fetchsvn {
+    url = "https://svn.code.sf.net/p/xavs/code/trunk";
+    rev = "${version}";
+    sha256 = "0drw16wm95dqszpl7j33y4gckz0w0107lnz6wkzb66f0dlbv48cf";
+  };
+
+  patchPhase = ''
+    patchShebangs configure
+    patchShebangs config.sub
+    patchShebangs version.sh
+    patchShebangs tools/countquant_xavs.pl
+    patchShebangs tools/patcheck
+    patchShebangs tools/regression-test.pl
+    patchShebangs tools/xavs-format
+  '';
+
+  configureFlags = [
+    "--enable-pic"
+    "--enable-shared"
+    # Bug preventing compilation with assembly enabled
+    "--disable-asm"
+  ];
+
+  meta = with stdenv.lib; {
+    description = "AVS encoder and decoder";
+    homepage    = http://xavs.sourceforge.net/;
+    license     = licenses.lgpl2;
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [ codyopel ];
+  };
+}

pkgs/top-level/all-packages.nix

···
   xapianBindings10 = callPackage ../development/libraries/xapian/bindings/1.0.x.nix {  # TODO perl php Java, tcl, C#, python
   };
 
+  xavs = callPackage ../development/libraries/xavs { };
+
   Xaw3d = callPackage ../development/libraries/Xaw3d { };
 
   xbase = callPackage ../development/libraries/xbase { };