cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/setregid.c -o unistd/setregid -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/setregid.c:11:28: error: ‘setregid’ undeclared here (not in a function); did you mean ‘setegid’?
   11 | int (*foo)(gid_t, gid_t) = setregid;
      |                            ^~~~~~~~
      |                            setegid