1 files changed, 11 insertions, 0 deletions

diff --git a/lib-src/digest-doc.c b/lib-src/digest-doc.c
index 7b5a9677e7c..7787d422e39 100644
--- a/lib-src/digest-doc.c
+++ b/lib-src/digest-doc.c
@@ -26,12 +26,23 @@
 
 #include <stdio.h>
 
+#ifdef DOS_NT
+#include <fcntl.h>              /* for O_BINARY */
+#include <io.h>                 /* for setmode */
+#endif
+
 int
 main ()
 {
   register int ch;
   register int notfirst = 0;
 
+#ifdef DOS_NT
+  /* DOC is a binary file.  */
+  if (!isatty (fileno (stdin)))
+    setmode (fileno (stdin), O_BINARY);
+#endif
+
   printf (".TL\n");
   printf ("Command Summary for GNU Emacs\n");
   printf (".AU\nRichard M. Stallman\n");