if Rubinius::BUILD_CONFIG[:vendor_libsodium]
    sodium = i.external_lib "build/libraries/libsodium" do |l|
      l.cflags = ["-I#{src}/build/libraries/libsodium/src/libsodium/include"] + gcc.cflags
      l.objects = [l.file("src/libsodium/.libs/libsodium.a")]
      l.to_build do |x|