clang -O2  -Wall -Wextra -Werror=implicit-function-declaration time/timer_getoverrun.c -o time/timer_getoverrun -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
../out/minix/basic/time/timer_getoverrun.o: In function `on_signal':
time/timer_getoverrun.c:(.text+0x307): undefined reference to `timer_getoverrun'
time/timer_getoverrun.c:(.text+0x31d): undefined reference to `timer_getoverrun'
../out/minix/basic/time/timer_getoverrun.o: In function `main':
time/timer_getoverrun.c:(.text+0x536): undefined reference to `timer_create'
time/timer_getoverrun.c:(.text+0x5cb): undefined reference to `__timer_settime50'
time/timer_getoverrun.c:(.text+0x644): undefined reference to `clock_nanosleep'
clang: error: linker command failed with exit code 1 (use -v to see invocation)