CPU libraries link with the flags in scripts/env.sh. On Darwin that is -undefined dynamic_lookup. On Linux it is --unresolved-symbols=ignore-all and -z undefs. enif_* symbols stay undefined until beam.smp loads the file.
Darwin otool -L on these libraries lists @rpath/libKGENCompilerRTShared.dylib and an rpath into the venv's modular/lib. Linux Stage 0 libpoc.so did not DT_NEEDED that library (E19). Later Linux libraries have not been inspected.
This repo does not copy KGEN into a release. The license question was not settled, so the prerequisite is: Mojo 1.1.0 is installed, and the dynamic loader can see the runtime the build recorded. scripts/release-candidate.sh passed on this Mac because that venv was still on disk. Moving the release to a machine without that runtime is untested and should be expected to fail at dlopen until the rpath or DYLD_LIBRARY_PATH / LD_LIBRARY_PATH is set on purpose.
CPU consumers install requirements.txt only. requirements-gpu.txt is the MAX pin for scripts/gpu-batch.sh. A CPU mix test does not import max.
load_nif appends .so on Darwin and on Linux. The Mix compiler publishes priv/native/lib<name>.so by rename. It will not rename over a library this VM has already loaded.
Unload of Mojoler.Own frees the private type box. It does not free the NIF entry. See stages/s1.md.