clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/getresgid.c -o unistd/getresgid -D_POSIX_C_SOURCE=202405L  -lm  -lintl
unistd/getresgid.c:11:65: error: use of undeclared identifier 'getresgid'; did you mean 'getegid'?
int (*foo)(gid_t *restrict, gid_t *restrict, gid_t *restrict) = getresgid;
                                                                ^~~~~~~~~
                                                                getegid
/usr/include/unistd.h:116:8: note: 'getegid' declared here
gid_t    getegid(void);
         ^
unistd/getresgid.c:11:7: error: incompatible pointer types initializing 'int (*)(__gid_t *restrict, __gid_t *restrict, __gid_t *restrict)' with an expression of type '__gid_t (void)' [-Werror,-Wincompatible-pointer-types]
int (*foo)(gid_t *restrict, gid_t *restrict, gid_t *restrict) = getresgid;
      ^                                                         ~~~~~~~~~
2 errors generated.