SDL_sixel: init at 1.2-nightly

SDL_sixel is a fork of SDL1.2 that supports sixel as a video driver (for
console graphics)

pkgs/development/libraries/SDL_sixel/default.nix

···
+{ stdenv, fetchFromGitHub, pkgconfig, libsixel }:
+
+stdenv.mkDerivation rec {
+  name    = "SDL_sixel-${version}";
+  version = "1.2-nightly";
+
+  src = fetchFromGitHub {
+    owner = "saitoha";
+    repo = "SDL1.2-SIXEL";
+    rev = "ab3fccac6e34260a617be511bd8c2b2beae41952";
+    sha256 = "0gm2vngdac17lzw9azkhzazmfq3byjddms14gqjk18vnynfqp5wp";
+  };
+
+  configureFlags = [ "--enable-video-sixel" ];
+
+  buildInputs = [ pkgconfig libsixel ];
+
+  meta = with stdenv.lib; {
+    description = "A cross-platform multimedia library, that supports sixel graphics on consoles";
+    homepage    = https://github.com/saitoha/SDL1.2-SIXEL;
+    maintainers = with maintainers; [ vrthra ];
+    platforms   = platforms.linux;
+    license     = licenses.lgpl21;
+  };
+}

pkgs/top-level/all-packages.nix

···
     inherit (darwin.apple_sdk.frameworks) OpenGL CoreAudio CoreServices AudioUnit Kernel Cocoa;
   };
 
+  SDL_sixel = callPackage ../development/libraries/SDL_sixel { };
+
   SDL_gfx = callPackage ../development/libraries/SDL_gfx { };
 
   SDL_image = callPackage ../development/libraries/SDL_image { };