The system calls are documented and backward compatible. However, Glib-C is only forward compatible, but not forward compatible. An application, built linking against an older version of Glibc than the one found at the deployment machine, is pretty likely to work on this machine, whereas the other way around will result on a linking error.

By using MUSL it is possible to build fully statically linked applications that works everywhere, however dlopen(), dlclose() calls, that are used for loading shared libraries and plugin at runtime on Unix-like systems, do not work with MUSL.