anchor.diff:        };
   
         # fix a bug in the header file, which causes bagel to fail
  -      libxc = self_.libxc.overrideDerivation (oa: {
  +      libxc = self_.libxc.overrideAttrs (oa: {
           postFixup = ''
             sed -i '/#include "config.h"/d' $out/include/xc.h
           '';
  
positive.code:       libcint3 = callPackage ./libcint { };
  
        libefp = callPackage ./libefp {};
  
        libint2 = callPackage ./libint { inherit optAVX; };
  
  
negative.code: 
        pcmsolver = callPackage ./pcmsolver {};
  
        psi4 = super.python3.pkgs.toPythonApplication self.python3.pkgs.psi4;
        psi4Unstable = super.python3.pkgs.toPythonApplication self.python3.pkgs.psi4Unstable;
  
        qdng = callPackage ./qdng { protobuf=super.protobuf3_11; };
  
  