clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/setkey.c -o stdlib/setkey -D_POSIX_C_SOURCE=202405L  -lm  -lintl
stdlib/setkey.c:11:8: error: incompatible pointer types initializing 'void (*)(const char *)' with an expression of type 'int (const char *)' [-Werror,-Wincompatible-pointer-types]
void (*foo)(const char *) = setkey;
       ^                    ~~~~~~
1 error generated.