--- configure.ac.orig	2013-12-06 16:51:21
+++ configure.ac	2024-07-01 13:38:23
@@ -146,7 +146,7 @@
 # check that pointers can be stored in doubles
 AC_MSG_CHECKING(whether pointers can be stored in doubles)
 AC_TRY_RUN([
-main () {
+int main(void) {
   if (sizeof (void *) > sizeof (double))
     return 1;
   return 0;
--- configure.orig	2013-12-06 16:51:37
+++ configure	2024-07-01 13:38:12
@@ -12399,7 +12399,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
-main () {
+int main(void) {
   if (sizeof (void *) > sizeof (double))
     return 1;
   return 0;