--- mfhdf/test/tszip.c.orig	2020-03-04 02:40:50.000000000 +0900
+++ mfhdf/test/tszip.c	2020-11-22 06:06:46.000000000 +0900
@@ -16,6 +16,7 @@
 #ifdef H4_HAVE_LIBSZ
 #include "szlib.h"
 #endif
+extern intn make_datafilename(char*, char*, unsigned int );
 
 #define FILE_NAME8	"SDS_8_sziped.hdf"
 #define FILE_NAME16	"SDS_16_sziped.hdf"