commit 36c07df
Author: Adar Dembo <adar@cloudera.com>
Date:   Tue Oct 29 10:13:37 2019 -0700

    Allow building gumbo-parser with autoconf 2.63
    
    This is found on CentOS 6.6.

diff --git a/configure.ac b/configure.ac
index 32dc9b9..c0fb407 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.65])
+AC_PREREQ([2.63])
 AC_INIT([gumbo], [0.10.1], [jonathan.d.tang@gmail.com])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/parser.c])
diff --git a/m4/created b/m4/created
new file mode 100644
index 0000000..5159d8b
--- /dev/null
+++ b/m4/created
@@ -0,0 +1 @@
+# This file exists so that the m4 directory can exist in the git repo.