1 files changed, 5 insertions, 0 deletions

diff --git a/src/s/osf1.h b/src/s/osf1.h
index f649aa203f6..16aadd4a3a2 100644
--- a/src/s/osf1.h
+++ b/src/s/osf1.h
@@ -22,3 +22,8 @@
 #define INTERRUPTIBLE_IO
 
 #define SYSV_SYSTEM_DIR
+
+/* If your system uses COFF (Common Object File Format) then define the
+   preprocessor symbol "COFF". */
+
+#define COFF