anchor.diff:              ''
                 ./configure \
                   PREFIX=${placeholder "dev"} \
  -                BINDIR=${placeholder "out"}/bin
  +                BINDIR=${placeholder "bin"}/bin
               '';
           };
   
  
positive.code:           [
              buildPackages.bison
              buildPackages.flex
              buildPackages.lowdown
              buildPackages.mdbook
              buildPackages.autoconf-archive
              buildPackages.autoreconfHook
  
negative.code: 
            src = lowdown-src;
  
            outputs = [ "out" "bin" "dev" ];
  
            nativeBuildInputs = [ which ];
  
  