anchor.diff:      sha256 = "0a8kfm1v96sv6jh4568crg6nkr6n3579i9xksfj8w199s6yxzsbk";
     };
   
  -  # touch config.rpath: work around bug in automake 1.10 ?
     preConfigure = ''
       find -type f -print0 | xargs --null sed -e "s@/usr/bin/perl@${perl}/bin/perl@" -i
  -    touch config.rpath
       ./autogen.sh
       sed -i -e "s@/usr/bin/file@${file}/bin/file@" ./configure
     '';
  +
  +  ## fix bug with parallel building
  +  preBuild = ''
  +    make -C cinelerra versioninfo.h
  +  '';
  +  enableParallelBuilding = true;
   
     buildInputs =
       [ automake
  
positive.code: , fontconfig, intltool }:
  
  stdenv.mkDerivation {
    name = "cinelerra-unstable-2018-05-16";
  
    src = fetchFromGitHub {
      owner = "ratopi";
  
negative.code:       fontconfig intltool
      ];
  
    meta = {
      description = "Video Editor";
      homepage = http://www.cinelerra.org;
  