Fix ext/intl build on ICU < 4.8

diff --git a/ext/intl/msgformat/msgformat_data.c b/ext/intl/msgformat/msgformat_data.c
index 4f93d6d98c3174b7a6852ead5b5a7bd4cd79d63b..527c1d4d179a4ab64e60556f58678014f4ebebb3 100755 (executable)
--- a/ext/intl/msgformat/msgformat_data.c
+++ b/ext/intl/msgformat/msgformat_data.c
@@ -21,6 +21,8 @@
 #include <unicode/ustring.h>
 #include "msgformat_data.h"
 
+#include "msgformat_class.h"
+
 /* {{{ void msgformat_data_init( msgformat_data* mf_data )
  * Initialize internals of msgformat_data.
  */