diff -r cf75cb35c083 -r 26b84b6da139 lib/App/read_httpd_conf.pm
--- a/lib/App/read_httpd_conf.pm	Wed Jul 16 23:37:06 2014 +0200
+++ b/lib/App/read_httpd_conf.pm	Mon Jan 12 14:57:36 2015 +0100
@@ -26,7 +26,7 @@
             $_ .= <$fh>;
             redo;
         }
-        if (/^\s*include\s+(?<quote>["'])?(?<file>.*?)\k<quote>?\s*$/i) {
+        if (/^\s*include(?:optional)\s+(?<quote>["'])?(?<file>.*?)\k<quote>?\s*$/i) {
             my $file = $+{file} =~ m{^/} ? $+{file} : "$basedir/$+{file}";
             say "# $. $file INCLUDE $+{file}";
             read_file($_, $basedir) foreach (glob -d $file ? "$file/*" : $file);