anchor.diff:      echo "manylinux1_compatible=False" >> $out/lib/${libPrefix}/_manylinux.py
     '';
   
  +  postFixup = ''
  +    # tkinter goes in a separate output
  +    mkdir -p $tkinter/${sitePackages}
  +    mv $out/lib/${libPrefix}/lib-dynload/_tkinter* $tkinter/${sitePackages}/
  +  '';
  +
  +  outputs = ["out" "tkinter"];
  +
     passthru = rec {
  -    inherit libPrefix;
  +    inherit libPrefix sitePackages;
       zlibSupport = zlib != null;
       sqliteSupport = sqlite != null;
       dbSupport = db != null;
  
positive.code:   pythonVersion = majorVersion;
    version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
    libPrefix = "python${majorVersion}";
  
    buildInputs = filter (p: p != null) [
      glibc
  
negative.code:     isPy3 = true;
      isPy35 = true;
      is_py3k = true;  # deprecated
      interpreter = "${self}/bin/${executable}";
    };
  
  