cc -O2 -pipe -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/setkey.c -o stdlib/setkey -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lstdthreads -lcrypt
stdlib/setkey.c:11:29: error: use of undeclared identifier 'setkey'
   11 | void (*foo)(const char *) = setkey;
      |                             ^
1 error generated.