Issues compiling on MacOS High Sierra

[orhanhenrik]

Hi, I'm having issues compiling this on MacOS High Sierra (10.13.4).

When trying to compile this project (rebar3 compile) I get the following output:

===> Verifying dependencies...
===> Compiling elmdb
cc /Users/orhan/Documents/projects/elmdb/c_src/elmdb_nif.o /Users/orhan/Documents/projects/elmdb/c_src/midl.o /Users/orhan/Documents/projects/elmdb/c_src/mdb.o -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib -I/usr/local/opt/flex/include -L/usr/local/opt/flex/lib -shared -L /usr/local/Cellar/erlang/20.3.7/lib/erlang/lib/erl_interface-3.10.2/lib -lerl_interface -lei -o /Users/orhan/Documents/projects/elmdb/c_src/../priv/elmdb.so
Undefined symbols for architecture x86_64:
  "_enif_alloc", referenced from:
      _elmdb_load in elmdb_nif.o
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      ...
  "_enif_alloc_env", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      ...
  "_enif_alloc_resource", referenced from:
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      _elmdb_db_open_handler in elmdb_nif.o
      _elmdb_update_get_handler in elmdb_nif.o
      _elmdb_txn_begin_handler in elmdb_nif.o
      _elmdb_txn_cursor_open_handler in elmdb_nif.o
      ...
  "_enif_cond_create", referenced from:
      _elmdb_env_thread in elmdb_nif.o
  "_enif_cond_destroy", referenced from:
      _elmdb_env_dtor in elmdb_nif.o
  "_enif_cond_signal", referenced from:
      _elmdb_env_close in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _close_all in elmdb_nif.o
      ...
  "_enif_cond_wait", referenced from:
      _elmdb_env_thread in elmdb_nif.o
  "_enif_free", referenced from:
      _elmdb_unload in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      _elmdb_txn_cursor_put in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      _close_env in elmdb_nif.o
      ...
  "_enif_free_env", referenced from:
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      _elmdb_txn_cursor_put in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      _close_env in elmdb_nif.o
      _do_async_put in elmdb_nif.o
      ...
  "_enif_get_list_cell", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
  "_enif_get_resource", referenced from:
      _elmdb_env_close in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_delete in elmdb_nif.o
      _elmdb_drop in elmdb_nif.o
      ...
  "_enif_get_string", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
  "_enif_get_tuple", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _to_mdb_cursor_op in elmdb_nif.o
  "_enif_get_uint", referenced from:
      _elmdb_env_open in elmdb_nif.o
  "_enif_get_ulong", referenced from:
      _elmdb_env_open in elmdb_nif.o
  "_enif_inspect_binary", referenced from:
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_ro_txn_get in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      ...
  "_enif_inspect_iolist_as_binary", referenced from:
      _elmdb_delete in elmdb_nif.o
  "_enif_is_atom", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_ro_txn_cursor_get in elmdb_nif.o
      _elmdb_txn_cursor_get in elmdb_nif.o
  "_enif_is_binary", referenced from:
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      _elmdb_txn_cursor_put in elmdb_nif.o
      _do_async_put in elmdb_nif.o
      _do_async_get in elmdb_nif.o
      _do_txn_put in elmdb_nif.o
      ...
  "_enif_is_identical", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _to_mdb_cursor_op in elmdb_nif.o
  "_enif_is_list", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
  "_enif_is_ref", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      ...
  "_enif_is_tuple", referenced from:
      _elmdb_ro_txn_cursor_get in elmdb_nif.o
      _elmdb_txn_cursor_get in elmdb_nif.o
  "_enif_keep_resource", referenced from:
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      ...
  "_enif_make_atom", referenced from:
      _elmdb_load in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_get in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_ro_txn_cursor_get in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      ...
  "_enif_make_badarg", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_env_close in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      ...
  "_enif_make_copy", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      ...
  "_enif_make_new_binary", referenced from:
      _elmdb_get in elmdb_nif.o
      _elmdb_ro_txn_get in elmdb_nif.o
      _elmdb_ro_txn_cursor_get in elmdb_nif.o
      _elmdb_async_get_handler in elmdb_nif.o
      _elmdb_update_get_handler in elmdb_nif.o
      _elmdb_txn_get_handler in elmdb_nif.o
      _elmdb_txn_cursor_get_handler in elmdb_nif.o
      ...
  "_enif_make_resource", referenced from:
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      _elmdb_db_open_handler in elmdb_nif.o
      _elmdb_update_get_handler in elmdb_nif.o
      _elmdb_txn_begin_handler in elmdb_nif.o
      _elmdb_txn_cursor_open_handler in elmdb_nif.o
      ...
  "_enif_make_string", referenced from:
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_delete in elmdb_nif.o
      _elmdb_drop in elmdb_nif.o
      ...
  "_enif_make_tuple", referenced from:
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_delete in elmdb_nif.o
      _elmdb_drop in elmdb_nif.o
      ...
  "_enif_mutex_create", referenced from:
      _elmdb_load in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
  "_enif_mutex_destroy", referenced from:
      _elmdb_env_dtor in elmdb_nif.o
  "_enif_mutex_lock", referenced from:
      _elmdb_env_close in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_delete in elmdb_nif.o
      ...
  "_enif_mutex_unlock", referenced from:
      _elmdb_env_close in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_put in elmdb_nif.o
      _elmdb_put_new in elmdb_nif.o
      _elmdb_get in elmdb_nif.o
      _elmdb_delete in elmdb_nif.o
      ...
  "_enif_open_resource_type", referenced from:
      _elmdb_load in elmdb_nif.o
  "_enif_priv_data", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _elmdb_env_close_all in elmdb_nif.o
  "_enif_release_resource", referenced from:
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      _elmdb_db_open_handler in elmdb_nif.o
      _elmdb_async_put_handler in elmdb_nif.o
      _elmdb_async_put_new_handler in elmdb_nif.o
      _elmdb_async_get_handler in elmdb_nif.o
      ...
  "_enif_self", referenced from:
      _elmdb_env_open in elmdb_nif.o
      _elmdb_db_open in elmdb_nif.o
      _elmdb_async_delete in elmdb_nif.o
      _elmdb_async_drop in elmdb_nif.o
      _elmdb_txn_begin in elmdb_nif.o
      _elmdb_txn_get in elmdb_nif.o
      _elmdb_txn_delete in elmdb_nif.o
      ...
  "_enif_send", referenced from:
      _elmdb_env_thread in elmdb_nif.o
      _close_env in elmdb_nif.o
      _elmdb_db_open_handler in elmdb_nif.o
      _elmdb_async_put_handler in elmdb_nif.o
      _elmdb_async_put_new_handler in elmdb_nif.o
      _elmdb_async_get_handler in elmdb_nif.o
      _elmdb_async_delete_handler in elmdb_nif.o
      ...
  "_enif_thread_create", referenced from:
      _elmdb_env_open in elmdb_nif.o
  "_enif_thread_join", referenced from:
      _elmdb_env_close in elmdb_nif.o
      _elmdb_env_close_by_name in elmdb_nif.o
      _close_all in elmdb_nif.o
      _elmdb_env_dtor in elmdb_nif.o
  "_enif_thread_self", referenced from:
      _elmdb_env_thread in elmdb_nif.o
  "_erl_errno_id", referenced from:
      _elmdb_get in elmdb_nif.o
      _elmdb_ro_txn_begin in elmdb_nif.o
      _elmdb_ro_txn_get in elmdb_nif.o
      _elmdb_ro_txn_cursor_open in elmdb_nif.o
      _elmdb_ro_txn_cursor_get in elmdb_nif.o
      _elmdb_env_thread in elmdb_nif.o
      ___strerror_int in elmdb_nif.o
      ...
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make: *** [/Users/orhan/Documents/projects/elmdb/c_src/../priv/elmdb.so] Error 1
===> Hook for compile failed!

Any ideas on how I can solve this issue? I have tried using different versions of gcc as well (4.9.4, 8.1.0 and Apple LLVM version 9.1.0 (clang-902.0.39.2))