clang -O2  -Wall -Wextra -Werror=implicit-function-declaration sys_mman/mlockall.c -o sys_mman/mlockall -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
../out/minix/basic/sys_mman/mlockall.o: In function `main':
sys_mman/mlockall.c:(.text+0x2fe): undefined reference to `mlockall'
clang: error: linker command failed with exit code 1 (use -v to see invocation)