--- jdiff06.orig/src/jdiffos.h
+++ jdiff06/src/jdiffos.h
@@ -11,6 +11,9 @@
  * PRIzd --> printf formatter for off_t without length (exluding the %)
  * define _JDIFF_LARGEFILE if off_t is 64 bits.
  */
+
+#define _JDIFF_LARGEFILE 1
+
 #if defined(_CYGWIN_LARGEFILE)
   #define off_t  off_t
   #define PRIzd  "lld"
--- jdiff06.orig/src/jpatch.c
+++ jdiff06/src/jpatch.c
@@ -291,10 +291,10 @@
     /*fprintf(stddbg, "  -l               Ascii patch file.\n");*/
     fprintf(stddbg, "Principles:\n");
     fprintf(stddbg, "  JPATCH reapplies a diff file, generated by jdiff, to the <original file>,\n") ;
-    fprintf(stddbg, "  restoring the <new file>. For example, if jpatch is called as follows:\n");
-    fprintf(stddbg, "    jdiff data01.tar data02.tar data02.dif\n");
+    fprintf(stddbg, "  restoring the <new file>. For example, if jdiff is used as follows:\n");
+    fprintf(stddbg, "    jdiff data01.tar data02.tar data02.jdiff\n");
     fprintf(stddbg, "  then data02.tar can be restored as follows:\n");
-    fprintf(stddbg, "    jpatch data01.tar data02.dif data02.tar\n");
+    fprintf(stddbg, "    jpatch data01.tar data02.jdiff data02.tar\n");
     fprintf(stddbg, "\n");
                      /******************************************************************************/
     exit(1);