diff '--color=auto' -ruN ctags-abc8fca7499f44c725122881cd380a88c37abe0e.orig/configure.ac ctags-abc8fca7499f44c725122881cd380a88c37abe0e/configure.ac
--- ctags-abc8fca7499f44c725122881cd380a88c37abe0e.orig/configure.ac	2016-11-23 10:52:52.000000000 +0100
+++ ctags-abc8fca7499f44c725122881cd380a88c37abe0e/configure.ac	2024-11-05 00:53:01.050413525 +0100
@@ -369,7 +369,8 @@
 AC_EXEEXT
 
 AC_MSG_CHECKING(if struct stat contains st_ino)
-AC_TRY_COMPILE([#include <sys/stat.h>], [
+AC_TRY_COMPILE([#include <sys/stat.h>
+#include <stdlib.h>], [
 	struct stat st;
 	stat(".", &st);
 	if (st.st_ino > 0)
@@ -449,6 +450,7 @@
 	AC_TRY_RUN([
 #include <sys/types.h>
 #include <regex.h>
+#include <stdlib.h>
 main() {
 	regex_t patbuf;
 	exit (regcomp (&patbuf, "/hello/", 0) != 0);