cc -O2 -pthread  -Wall -Wextra -Werror=implicit-function-declaration unistd/setresuid.c -o unistd/setresuid -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lintl -lcrypt
unistd/setresuid.c: In function 'main':
unistd/setresuid.c:11:7: error: implicit declaration of function 'getresuid'; did you mean 'setreuid'? [-Werror=implicit-function-declaration]
   11 |  if ( getresuid(&ruid, &euid, &suid) < 0 )
      |       ^~~~~~~~~
      |       setreuid
unistd/setresuid.c:13:7: error: implicit declaration of function 'setresuid'; did you mean 'setreuid'? [-Werror=implicit-function-declaration]
   13 |  if ( setresuid(ruid, euid, suid) < 0 )
      |       ^~~~~~~~~
      |       setreuid
cc1: some warnings being treated as errors