--- configure.ac.orig	2017-09-25 03:12:49
+++ configure.ac	2023-07-27 04:29:47
@@ -1014,6 +1014,7 @@
 
                             -g -O2 -fomit-frame-pointer
                     */
+                    #include <string.h>
 
                     int foo ()
                     {
--- autoconf/hercules.m4.orig	2017-09-25 03:12:49
+++ autoconf/hercules.m4	2023-07-27 04:36:58
@@ -331,7 +331,7 @@
         [hc_cv_need_getopt_optreset],
         [
             AC_TRY_LINK(
-                [],
+                [#include <unistd.h>],
                 [
                     extern int optreset;
                     optreset=1;