clang -O2   -Wall -Wextra -Werror=implicit-function-declaration sys_mman/shm_unlink.c -o sys_mman/shm_unlink -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
../out/minix/basic/sys_mman/shm_unlink.o: In function `main':
sys_mman/shm_unlink.c:(.text+0x39f): undefined reference to `shm_open'
sys_mman/shm_unlink.c:(.text+0x3c6): undefined reference to `shm_unlink'
clang: error: linker command failed with exit code 1 (use -v to see invocation)