1 files changed, 4 insertions, 1 deletions

diff --git a/g10/g10.c b/g10/g10.c
index b27ae1339..2f9633c48 100644
--- a/g10/g10.c
+++ b/g10/g10.c
@@ -60,12 +60,15 @@
 
 #if defined(HAVE_DOSISH_SYSTEM) || defined(__CYGWIN__)
 #define MY_O_BINARY  O_BINARY
+#ifndef S_IRGRP
+# define S_IRGRP 0
+# define S_IWGRP 0
+#endif
 #else
 #define MY_O_BINARY  0
 #endif
 
 
-
 enum cmd_and_opt_values
   {
     aNull = 0,