Portability fixes for LSB compatibility.

diff --git a/include/config.h.in b/include/config.h.in
index 2877a15..6c0b598 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -308,6 +308,9 @@
 /* Define to 1 if you have the <linux/input.h> header file. */
 #undef HAVE_LINUX_INPUT_H
 
+/* Define to 1 if you have the <linux/ioctl.h> header file. */
+#undef HAVE_LINUX_IOCTL_H
+
 /* Define to 1 if you have the <linux/joystick.h> header file. */
 #undef HAVE_LINUX_JOYSTICK_H