diff -Naur ecl-8.12.0.orig/src/h/object.h ecl-8.12.0/src/h/object.h
--- ecl.orig/src/h/object.h	2008-12-17 16:41:53.000000000 +0100
+++ ecl/src/h/object.h	2008-12-17 19:35:05.000000000 +0100
@@ -23,8 +23,13 @@
 	Integer and boolean types (see config.h)
 */
 
+#ifndef TRUE
 #define	TRUE		1	/*  boolean true value  */
+#endif
+
+#ifndef FALSE
 #define	FALSE		0	/*  boolean false value  */
+#endif
 
 #if !defined(__cplusplus) && !defined(bool)
 typedef int bool;