1 files changed, 8 insertions, 0 deletions
diff --git a/basic.h b/basic.h
index f03d507..7322fae 100644
--- a/basic.h
+++ b/basic.h
@@ -26,9 +26,17 @@
 #define BASIC_H
 
 /* bool definitions */
+#ifndef bool
 #define bool int
+#endif
+
+#ifndef true
 #define true 1
+#endif
+
+#ifndef false
 #define false 0
+#endif
 
 #define BOOL_CAST(x) ((x) ? (true) : (false))