build: FAILED conformance/interfaces/sigqueue/6-1: build: FAILED: Compiler output: conformance/interfaces/sigqueue/6-1.c:58:12: error: use of undeclared identifier 'SIGRTMIN' sigaction(SIGTOTEST, &act, 0); ^ conformance/interfaces/sigqueue/6-1.c:28:19: note: expanded from macro 'SIGTOTEST' #define SIGTOTEST SIGRTMIN ^ conformance/interfaces/sigqueue/6-1.c:63:20: warning: implicit declaration of function 'sigqueue' is invalid in C99 [-Wimplicit-function-declaration] if ((return_val = sigqueue(pid, SIGTOTEST, value)) != 0) { ^ conformance/interfaces/sigqueue/6-1.c:63:34: error: use of undeclared identifier 'SIGRTMIN' if ((return_val = sigqueue(pid, SIGTOTEST, value)) != 0) { ^ conformance/interfaces/sigqueue/6-1.c:28:19: note: expanded from macro 'SIGTOTEST' #define SIGTOTEST SIGRTMIN ^ 1 warning and 2 errors generated.