cc -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 -liconv
unistd/setresuid.c: In function ‘main’:
unistd/setresuid.c:11:14: error: implicit declaration of function ‘getresuid’; did you mean ‘geteuid’? [-Wimplicit-function-declaration]
   11 |         if ( getresuid(&ruid, &euid, &suid) < 0 )
      |              ^~~~~~~~~
      |              geteuid
unistd/setresuid.c:13:14: error: implicit declaration of function ‘setresuid’; did you mean ‘seteuid’? [-Wimplicit-function-declaration]
   13 |         if ( setresuid(ruid, euid, suid) < 0 )
      |              ^~~~~~~~~
      |              seteuid