build: FAILED conformance/interfaces/sigaction/16-19: build: FAILED: Compiler output: conformance/interfaces/sigaction/16-19.c:150:19: error: use of undeclared identifier 'SIGPOLL' ret = sigaction( SIGNAL, &sa, 0 ); ^ conformance/interfaces/sigaction/16-19.c:89:16: note: expanded from macro 'SIGNAL' #define SIGNAL SIGPOLL ^ conformance/interfaces/sigaction/16-19.c:183:29: error: use of undeclared identifier 'SIGPOLL' ret = pthread_kill( child, SIGNAL ); ^ conformance/interfaces/sigaction/16-19.c:89:16: note: expanded from macro 'SIGNAL' #define SIGNAL SIGPOLL ^ 2 errors generated.