Fails to compile on Apple Intel with libsodium >=1.0.19

[IslandUsurper]

I had run into this error before, but ended up not worrying about it because I was using Nix to provide libsodium. Since my colleague is using Homebrew, and it doesn't provide older versions, this is going to become more of a problem.

enacl doesn't compile on MacOS (x86_64) when libsodium is above version 1.0.18. Both 1.0.19 and 1.0.20 don't work any more. Interestingly, the same Nix expression does allow enacl to compile on Linux, regardless of libsodium's version.

❯ mix deps.compile enacl
===> Fetching pc v1.13.0
===> Analyzing applications...
===> Compiling pc
===> Compiling c_src/aead.c
===> Compiling c_src/enacl.c
===> Compiling c_src/enacl_ext.c
===> Compiling /--redacted--/deps/enacl/c_src/enacl_nif.c
===> /--redacted--/deps/enacl/c_src/enacl_nif.c:435:83: error: incompatible function pointer types initializing 'void (*)(ErlNifEnv *, void *)' (aka 'void (*)(struct enif_environment_t *, void *)') with an expression of type 'int (ErlNifEnv *, void **, ERL_NIF_TERM)' (aka 'int (struct enif_environment_t *, void **, unsigned long)') [-Wincompatible-function-pointer-types]
ERL_NIF_INIT(enacl_nif, nif_funcs, enacl_crypto_load, NULL, enacl_crypto_upgrade, enacl_crypto_unload);
                                                                                  ^~~~~~~~~~~~~~~~~~~
/nix/store/m7zydgpnsqiqnzf8sbbrhqcvxicbm396-erlang-25.3.2.10/lib/erlang/erts-13.2.2.7/include/erl_nif.h:422:25: note: expanded from macro 'ERL_NIF_INIT'
        LOAD, RELOAD, UPGRADE, UNLOAD,  \
                               ^~~~~~
1 error generated.

I see the existing issues and PRs about Apple silicon, but I have none available to test with.