-pthread means -D_REENTRANT and -lpthread. -D_REENTRANT is basically useless and you should use standard feature test macros or _GNU_SOURCE for what you want. So just linking with -lpthread is what I would call the normal and recommended practice. The man pages are not maintained by people who ask the people who know. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list