--- libmcal.orig/icalroutines.h	2003-01-28 18:45:21.000000000 +0100
+++ libmcal/icalroutines.h	2013-02-04 01:54:27.833995640 +0100
@@ -48,8 +48,10 @@
 
 
 /* ICAL parser. */
+#ifndef ical_yytext
 extern char	*ical_yytext;
-extern int	ical_yyleng;
+extern size_t	ical_yyleng;
+#endif
 int		ical_yylex(void);
 void		ical_usebuf(const char *buf, size_t size);
 void		ical_preprocess(char *buf, size_t *size);