anchor.diff:  , bash
   , fetchurl
   , perl
  -, gfortran
  +, gfortran6
   , python
   , autoreconfHook
   , gettext
  
positive.code:     rm -f "$out/sage-root/config.status"
      rm -f "$out/sage-root/build/make/Makefile-auto"
      rm -f "$out/sage-home/.sage/gap/libgap-workspace-"*
      # Make sure all shebangs are properly patched
      bash $patchSageShebangs $out
    '';
  
negative.code:     bash # needed for the build
      perl # needed for the build
      python # needed for the build
      gfortran6 # needed to build giac, openblas
      autoreconfHook # needed to configure sage with prefix
      gettext # needed to build the singular spkg
      which # needed in configure of mpir
      texinfo # needed to build maxima
    ] ++ stdenv.lib.optionals(buildDocs) [
      hevea # needed to build the docs of the giac spkg
      (texlive.combine { inherit (texlive)
        scheme-basic
        collection-pstricks # needed by giac
  