--- a/targets/plc_debug.c	Tue Feb 26 01:17:53 2013 +0100
+++ b/targets/plc_debug.c	Tue Feb 26 16:37:17 2013 +0900
@@ -312,7 +312,9 @@
 #define LOG_INFO 2
 #define LOG_DEBUG 3
 
+#ifndef LOG_BUFFER_SIZE
 #define LOG_BUFFER_SIZE (1<<14) /*16Ko*/
+#endif
 #define LOG_BUFFER_MASK (LOG_BUFFER_SIZE-1)
 static char LogBuff[LOG_LEVELS][LOG_BUFFER_SIZE];
 void inline copy_to_log(uint8_t level, uint32_t buffpos, void* buf, uint32_t size){