diff '--color=auto' -ruN ctags-abc8fca7499f44c725122881cd380a88c37abe0e.orig/configure.ac ctags-abc8fca7499f44c725122881cd380a88c37abe0e/configure.ac
--- ctags-abc8fca7499f44c725122881cd380a88c37abe0e.orig/configure.ac	2024-11-05 00:55:57.281788938 +0100
+++ ctags-abc8fca7499f44c725122881cd380a88c37abe0e/configure.ac	2024-11-05 00:59:21.852536947 +0100
@@ -451,7 +451,7 @@
 #include <sys/types.h>
 #include <regex.h>
 #include <stdlib.h>
-main() {
+int main() {
 	regex_t patbuf;
 	exit (regcomp (&patbuf, "/hello/", 0) != 0);
 }],regcomp_works=yes,regcomp_works=no,AC_DEFINE(CHECK_REGCOMP))