roc-toolkit: fix build on darwin

    ++ lib.optional soxSupport sox

    ++ lib.optional libsndfileSupport libsndfile;

  sconsFlags =

  sconsFlags = lib.optionals (!stdenv.hostPlatform.isDarwin)

    [ "--build=${stdenv.buildPlatform.config}"

      "--host=${stdenv.hostPlatform.config}"

      "--prefix=${placeholder "out"}" ] ++

      "--host=${stdenv.hostPlatform.config}" ] ++

    [ "--prefix=${placeholder "out"}" ] ++

    lib.optional (!opensslSupport) "--disable-openssl" ++

    lib.optional (!soxSupport) "--disable-sox" ++

    lib.optional (!libunwindSupport) "--disable-libunwind" ++