1 files changed, 8 insertions, 1 deletions
diff --git a/byterun.h b/byterun.h
index fee8eda438..b8c557ccbb 100644
--- a/byterun.h
+++ b/byterun.h
@@ -1,5 +1,5 @@
 /*
- *      Copyright (c) 1996 Malcolm Beattie
+ *      Copyright (c) 1996, 1997 Malcolm Beattie
  *
  *      You may distribute under the terms of either the GNU General Public
  *      License or the Artistic License, as specified in the README file.
@@ -21,6 +21,13 @@ void byterun _((struct bytestream));
 void byterun _((FILE *));
 #endif /* INDIRECT_BGET_MACROS */
 
+#ifndef PATCHLEVEL
+#include "patchlevel.h"
+#endif
+#if PATCHLEVEL < 4 || (PATCHLEVEL == 4 && SUBVERSION < 50)
+#define dTHR extern int errno
+#endif
+
 enum {
     INSN_RET,			/* 0 */
     INSN_LDSV,			/* 1 */