clang -O2  -Wall -Wextra -Werror=implicit-function-declaration time/clock_nanosleep.c -o time/clock_nanosleep -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
../out/minix/basic/time/clock_nanosleep.o: In function `main':
time/clock_nanosleep.c:(.text+0x32e): undefined reference to `clock_nanosleep'
clang: error: linker command failed with exit code 1 (use -v to see invocation)