Include info table header.

diff --git a/php_imlib.c b/php_imlib.c
index e1a2828..7adbd8f 100644
--- a/php_imlib.c
+++ b/php_imlib.c
@@ -22,6 +22,7 @@
 #include "php_imlib.h"
 #include "php_globals.h"
 #include "php_open_temporary_file.h"
+#include "ext/standard/info.h"

 /* #define IMLIB_DEBUG */