anchor.diff: -{ lib, stdenv, fetchFromGitHub, fetchpatch, autoconf, automake, libtool
  +{ lib, stdenv, fetchFromGitHub, autoconf, automake, libtool
   , pkg-config, faad2, faac, a52dec, alsaLib, fftw, lame, libavc1394
   , libiec61883, libraw1394, libsndfile, libvorbis, libogg, libjpeg
   , libtiff, freetype, mjpegtools, x264, gettext, openexr
  
positive.code: , fontconfig, intltool }:
  
  stdenv.mkDerivation {
    name = "cinelerra-cv-2018-05-16";
  
    src = fetchFromGitHub {
      owner = "cinelerra-cv-team";
      repo = "cinelerra-cv";
      rev = "d9c0dbf4393717f0a42f4b91c3e1ed5b16f955dc";
      sha256 = "0a8kfm1v96sv6jh4568crg6nkr6n3579i9xksfj8w199s6yxzsbk";
    };
  
    patches = [
      # avoid gcc10 error about narrowing
      (fetchpatch {
        url = "https://github.com/cinelerra-cv-team/cinelerra-cv/pull/2/commits/a1b2d9c3bd5730ec0284894f3d81892af3e77f1f.patch";
        sha256 = "1cjyv1m174dblpa1bs5dggk24h4477zqvc5sbfc0m5rpkndx5ycp";
      })
    ];
  
    preConfigure = ''
      find -type f -print0 | xargs --null sed -e "s@/usr/bin/perl@${perl}/bin/perl@" -i
  
negative.code:     ];
  
    meta = with lib; {
      description = "Professional video editing and compositing environment (community version)";
      homepage = "http://cinelerra-cv.wikidot.com/";
      maintainers = with maintainers; [ marcweber ];
      license = licenses.gpl2Only;
    };
  