Undefined error of "enif_make_string" happens to erlang nif function

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Thanks a lot.

However, I still have an error.

 gcc -fPIC -shared -o niftest.so niftest.c -I $ERL_ROOT/usr/include/ -bundle -bundle_loader $ERL_ROOT/erts-12.3/bin/beam.smp

clang: error: invalid argument '-bundle' not allowed with '-dynamiclib'

I think this comes from using clang instead of gcc although I don’t know how -bundle works. I will check the option.