cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/crypt.c -o unistd/crypt -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/crypt.c:11:44: error: ‘crypt’ undeclared here (not in a function)
   11 | char *(*foo)(const char *, const char *) = crypt;
      |                                            ^~~~~