anchor.diff: -{ stdenv, fetchurl, cmake, bash, unzip, glibc, openssl, gcc, mesa, freetype, xlibs, alsaLib }:
  +{ stdenv, fetchurl, cmake, bash, unzip, glibc, openssl, gcc, mesa, freetype, xlibs, alsaLib, cairo }:
   
   stdenv.mkDerivation rec {
   
  
positive.code:     unzip ${sources30Zip} -d $prefix/lib/pharo-vm/
    '';
  
    buildInputs = [ bash unzip cmake glibc openssl gcc mesa freetype xlibs.libX11 xlibs.libICE xlibs.libSM alsaLib ];
  
    meta = {
      description = "Clean and innovative Smalltalk-inspired environment";
  
negative.code:     maintainers = [ stdenv.lib.maintainers.DamienCassou ];
      platforms = stdenv.lib.platforms.mesaPlatforms;
    };
  }
  