Hi Daniel, > MUSL does not include __SIGRTMIN nor __SIGRTMAX. The > compatibility header can help here. lib/tst_sig.c and testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c also use __SIGRTMIN. Don't you have a problem to build it? + I'd squash adding of these includes into single commit. Kind regards, Petr