diff -up NetworkManager-0.7.0/src/nm-serial-device.c.foo NetworkManager-0.7.0/src/nm-serial-device.c
--- NetworkManager-0.7.0/src/nm-serial-device.c.foo	2008-04-10 12:51:43.000000000 -0400
+++ NetworkManager-0.7.0/src/nm-serial-device.c	2008-04-10 12:51:49.000000000 -0400
@@ -19,7 +19,7 @@
 #include "nm-setting-ppp.h"
 #include "nm-utils.h"
 
-/* #define NM_DEBUG_SERIAL 1 */
+#define NM_DEBUG_SERIAL 1
 
 #define SERIAL_BUF_SIZE 2048