clang -O2   -Wall -Wextra -Werror=implicit-function-declaration mqueue/mq_notify.c -o mqueue/mq_notify -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
../out/minix/basic/mqueue/mq_notify.o: In function `main':
mqueue/mq_notify.c:(.text+0x513): undefined reference to `mq_open'
mqueue/mq_notify.c:(.text+0x62b): undefined reference to `mq_notify'
mqueue/mq_notify.c:(.text+0x66b): undefined reference to `mq_notify'
mqueue/mq_notify.c:(.text+0x6a1): undefined reference to `mq_send'
mqueue/mq_notify.c:(.text+0x6d9): undefined reference to `mq_notify'
mqueue/mq_notify.c:(.text+0x6f1): undefined reference to `mq_notify'
../out/minix/basic/mqueue/mq_notify.o: In function `cleanup':
mqueue/mq_notify.c:(.text+0x81b): undefined reference to `mq_unlink'
../out/minix/basic/mqueue/mq_notify.o: In function `on_signal':
mqueue/mq_notify.c:(.text+0x92f): undefined reference to `mq_unlink'
clang: error: linker command failed with exit code 1 (use -v to see invocation)