build: FAILED conformance/interfaces/timer_create/16-1: build: FAILED: Compiler output: conformance/interfaces/timer_create/16-1.c:22:18: error: variable has incomplete type 'struct sigevent' struct sigevent ev; ^ conformance/interfaces/timer_create/16-1.c:22:9: note: forward declaration of 'struct sigevent' struct sigevent ev; ^ conformance/interfaces/timer_create/16-1.c:25:20: error: use of undeclared identifier 'SIGEV_SIGNAL' ev.sigev_notify = SIGEV_SIGNAL; ^ conformance/interfaces/timer_create/16-1.c:28:6: warning: implicit declaration of function 'timer_create' is invalid in C99 [-Wimplicit-function-declaration] if (timer_create(INVALIDCLOCKID, &ev, &tid) == -1) { ^ 1 warning and 2 errors generated.