http://bugs.gentoo.org/479808
http://lists.linuxtogo.org/pipermail/openembedded-core/2013-February/036049.html

TRUE & FALSE have to be undefined in order to define the boolean enum

--- jmorecfg.h
+++ jmorecfg.h
@@ -260,6 +260,8 @@ typedef void noreturn_t;
 #define TRUE	1
 #endif
 #else
+#undef TRUE
+#undef FALSE
 typedef enum { FALSE = 0, TRUE = 1 } boolean;
 #endif