libfaketime: use --replace-fail

    patchShebangs test src

    for a in test/functests/test_exclude_mono.sh src/faketime.c ; do

      substituteInPlace $a \

        --replace /bin/bash ${stdenv.shell}

        --replace-fail /bin/bash ${stdenv.shell}

    done

    substituteInPlace src/faketime.c --replace @DATE_CMD@ ${coreutils}/bin/date

    substituteInPlace src/faketime.c --replace-fail @DATE_CMD@ ${coreutils}/bin/date

  '';

  PREFIX = placeholder "out";