anchor.diff:  , cmake
   , curl
   , nasm
  -, openmpt123
  +, libopenmpt
   , p7zip
   , libgme
   , libpng
  
positive.code:     curl
      libgme
      libpng
      openmpt123
      SDL2
      SDL2_mixer
      zlib
  
negative.code:   cmakeFlags = [
      "-DSRB2_ASSET_DIRECTORY=/build/source/assets"
      "-DGME_INCLUDE_DIR=${libgme}/include"
      "-DOPENMPT_INCLUDE_DIR=${libopenmpt.dev}/include"
      "-DSDL2_MIXER_INCLUDE_DIR=${SDL2_mixer}/include/SDL2"
      "-DSDL2_INCLUDE_DIR=${SDL2.dev}/include/SDL2"
    ];
  