anchor.diff:  , fetchFromGitHub
   , libyaml
   , swig
  +, eigen
   , pkgconfig
   , wafHook
   , makeWrapper
  
positive.code: 
    buildInputs = [
      libyaml
      qt4
    ];
  
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gaia";
    version = "2.4.6";
  
    src = fetchFromGitHub {
      owner = "MTG";
      repo = "gaia";
      rev = "v${version}";
      sha256 = "03vmdq7ca4f7zp2f4sxyqa8sdpdma3mn9fz4z7d93qryl0bhi7z3";
    };
  
    # Fix installation error when waf tries to put files in /etc/
  