1 files changed, 3 insertions, 0 deletions
diff --git a/lib-src/hexl.c b/lib-src/hexl.c
index 20504211b55..c183af7add4 100644
--- a/lib-src/hexl.c
+++ b/lib-src/hexl.c
@@ -12,7 +12,10 @@
 #define TRUE  (1)
 #define FALSE (0)
 
+#ifndef MSDOS
+/* Defined volatile by std.h in MsDos.  */
 extern void exit (), perror ();
+#endif
 
 int base = DEFAULT_BASE, un_flag = FALSE, iso_flag = FALSE, endian = 1;
 int group_by = DEFAULT_GROUPING;