add Sorcer, an LV2 synth.

pkgs/applications/audio/sorcer/default.nix

···
+{ stdenv, fetchurl, boost, cairomm, cmake, libsndfile, lv2, ntk, pkgconfig, python }:
+
+stdenv.mkDerivation rec {
+  name = "sorcer-${version}";
+  version = "1.1.1";
+
+  src = fetchurl {
+    url = "https://github.com/harryhaaren/openAV-Sorcer/archive/release-${version}.tar.gz";
+    sha256 = "1jkhs2rhn4givac7rlbj8067r7qq6jnj3ixabb346nw7pd6gn1wn";
+  };
+
+  buildInputs = [ boost cairomm cmake libsndfile lv2 ntk pkgconfig python ];
+
+  installPhase = ''
+    make install
+    cp -a ../presets/* "$out/lib/lv2"
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = http://openavproductions.com/sorcer/;
+    description = "A wavetable LV2 plugin synth, targeted at the electronic / dubstep genre";
+    license = licenses.gpl3;
+    maintainers = [ maintainers.magnetophon ];
+    platforms = platforms.linux;
+  };
+}

pkgs/development/libraries/audio/ntk/default.nix

···
+{ stdenv, fetchgit, cairo, libjpeg, libXft, pkgconfig, python2 }:
+
+stdenv.mkDerivation rec {
+  name = "ntk-${version}";
+  version = "2014-10-18";
+  src = fetchgit {
+    url = "git://git.tuxfamily.org/gitroot/non/fltk.git";
+    rev = "5719b0044d9f267de5391fab006370cc7f4e70bd";
+    sha256 = "7ecedb049e00cc9a1bb0e0e2f02e5a734c873653b68551e6573474c04abe1821";
+  };
+
+  buildInputs = [
+    cairo libjpeg libXft pkgconfig python2
+  ];
+
+  buildPhase = ''
+    python waf configure --prefix=$out
+    python waf
+  '';
+
+  installPhase = ''
+    python waf install
+  '';
+
+  meta = {
+    description = "Fork of FLTK 1.3.0 with additional functionality.";
+    version = "${version}";
+    homepage = "http://non.tuxfamily.org/";
+    license = stdenv.lib.licenses.lgpl21;
+    maintainers = [ stdenv.lib.maintainers.magnetophon ];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
     includeTools = true;
   };
 
+  ntk = callPackage ../development/libraries/audio/ntk { };
+
   ntrack = callPackage ../development/libraries/ntrack { };
 
   nvidia-texture-tools = callPackage ../development/libraries/nvidia-texture-tools { };
···
   slrn = callPackage ../applications/networking/newsreaders/slrn { };
 
   sooperlooper = callPackage ../applications/audio/sooperlooper { };
+
+  sorcer = callPackage ../applications/audio/sorcer { };
 
   sound-juicer = callPackage ../applications/audio/sound-juicer { };