Hi, In my environment (AIX & MariaDB v10.4.3 or 10.4.4), I have: include/config.h: #define HAVE_SIGWAITINFO 1 and thus in the file : include/my_pthread.h : static inline int my_sigwait(sigset_t *set, int *sig, int *code) { #ifdef HAVE_SIGWAITINFO siginfo_t siginfo; *sig= sigwaitinfo(set, &siginfo); *code= siginfo.si_code; return *sig < 0 ? errno : 0; #else #define SI_KERNEL 128 *code= 0; return sigwait(set, sig); #endif } the SI_KERNEL macro is NOT defined. Then, I get the following error at compilation: mariadb-10.4.3/sql/mysqld.cc:3272:36: error: 'SI_KERNEL' was not declared in this scope if (!abort_loop && origin != SI_KERNEL) The attached patch is an easy work-around for fixing the issue. However, it may not be the perfect appropriate change. Since I do not master MariaDB, I'd like someone to propose a fully correct fix. Thanks/Regards, Tony Reix tony.reix@atos.net ATOS / Bull SAS ATOS Expert IBM Coop Architect & Technical Leader Office : +33 (0) 4 76 29 72 67 1 rue de Provence - 38432 Échirolles - France www.atos.net