cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration unistd/getresuid.c -o unistd/getresuid -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lnetwork -lbsd -latomic
unistd/getresuid.c: In function 'main':
unistd/getresuid.c:11:14: error: implicit declaration of function 'getresuid'; did you mean 'setreuid'? [-Werror=implicit-function-declaration]
   11 |         if ( getresuid(&ruid, &euid, &suid) < 0 )
      |              ^~~~~~~~~
      |              setreuid
cc1: some warnings being treated as errors