Today I released a bugfix version of ghc::filesystem . It only contains a fix for issue #21 , where compiling on Alpine Linux with musl instead of glibc chooses the wrong strerror_r signature.

The musl headers sadly don’t conform to the preprocessor expression of the linux man file (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE for strerror_r, so there was no well defined preprocessor way of solving this.

In the end, the already very complex preprocessor define mix was dropped in favor of the usual dispatch by overloading a unifying wrapper [8e824ce ].

You can grab the release from the releases page on GitHub.