diff -up openchange-openchange-2.3-VULCAN/libocpf/lex.l.no-yyunput openchange-openchange-2.3-VULCAN/libocpf/lex.l
--- openchange-openchange-2.3-VULCAN/libocpf/lex.l.no-yyunput	2016-04-07 21:57:52.155596453 +0200
+++ openchange-openchange-2.3-VULCAN/libocpf/lex.l	2016-04-07 21:58:19.397595467 +0200
@@ -29,7 +29,7 @@
 #include "libocpf/lex.h"
 
 #define	YY_EXTRA_TYPE	struct ocpf_context *
-#define	YY_NO_UNPUT
+/*#define	YY_NO_UNPUT*/
 
 static void unterminated(struct ocpf_context *, const char *, unsigned int);