anchor.diff:    # Work around <http://bugs.gnu.org/14201>.
     SHELL = "/bin/sh";
     CONFIG_SHELL = "/bin/sh";
  -}))
  +})
  
positive.code:   # don't have "libgcc_s.so.1" on darwin
    LDFLAGS = stdenv.lib.optionalString (!stdenv.isDarwin) "-lgcc_s";
  
    configureFlags = [ "--with-libreadline-prefix" ];
  
    postInstall = ''
      wrapProgram $out/bin/guile-snarf --prefix PATH : "${gawk}/bin"
  
negative.code:       processing.
      '';
    };
  })
  
  //
  