Detech -Wno-unused-functions for GCC too Otherwise build fails [1]: /home/runner/work/libevent/libevent/dist/libevent-2.2.0-alpha-dev/minheap-internal.h:64:6: error: ‘min_heap_ctor_’ defined but not used [-Werror=unused-function] void min_heap_ctor_(min_heap_t* s) { s->p = 0; s->n = 0; s->a = 0; } ^~~~~~~~~~~~~~ In file included from /home/runner/work/libevent/libevent/dist/libevent-2.2.0-alpha-dev/buffer.c:91:0: /home/runner/work/libevent/libevent/dist/libevent-2.2.0-alpha-dev/bufferevent-internal.h:414:1: error: ‘bufferevent_trigger_nolock_’ defined but not used [-Werror=unused-function] bufferevent_trigger_nolock_(struct bufferevent *bufev, short iotype, int options) ^~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /home/runner/work/libevent/libevent/dist/libevent-2.2.0-alpha-dev/buffer.c:89:0: /home/runner/work/libevent/libevent/dist/libevent-2.2.0-alpha-dev/evthread-internal.h:140:1: error: ‘EVLOCK_TRY_LOCK_’ defined but not used [-Werror=unused-function] EVLOCK_TRY_LOCK_(void *lock) [1]: https://github.com/libevent/libevent/runs/7263518180?check_suite_focus=true