clang -O2   -Wall -Wextra -Werror=implicit-function-declaration mqueue/mq_open.c -o mqueue/mq_open -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
../out/minix/basic/mqueue/mq_open.o: In function `main':
mqueue/mq_open.c:(.text+0x4df): undefined reference to `mq_open'
../out/minix/basic/mqueue/mq_open.o: In function `cleanup':
mqueue/mq_open.c:(.text+0x5db): undefined reference to `mq_unlink'
../out/minix/basic/mqueue/mq_open.o: In function `on_signal':
mqueue/mq_open.c:(.text+0x6ef): undefined reference to `mq_unlink'
clang: error: linker command failed with exit code 1 (use -v to see invocation)