anchor.diff:  
     # ================ START automatically generated code ================
            # WARNING: automatically generated CODE
  -         # This section has been generated by gem nix sup chronic rubygems-update xrefresh-server rb-inotify jeweler
  +         # This section has been generated by gem nix sup chronic rubygems-update xrefresh-server rb-inotify jeweler ncursesw
            # the gem nix command has been added by a nix patch to ruby gems
         
     json_pure_1_2_4 = rubyDerivation {
  
positive.code:        license = []; # one of ?
         description = "RMail is a lightweight mail library containing various utility classes and modules that allow ruby scripts to parse, modi"; # cut to 120 chars
         longDescription = "RMail is a lightweight mail library containing various utility classes and modules that allow ruby scripts to parse, modify, and generate MIME mail messages.";
       };
    };
  
  
negative.code: 
                for prog in $out/bin/*; do
                  wrapProgram "$prog" \
                    --prefix RUBYLIB : "$RUBYLIB":${rubygems}/lib \
                    --prefix GEM_PATH : "$GEM_PATH" \
                    --set RUBYOPT 'rubygems'
                done
  