1 files changed, 7 insertions, 0 deletions

diff --git a/src/s/irix6-5.h b/src/s/irix6-5.h
index d283571d8fb..26eb7dcde77 100644
--- a/src/s/irix6-5.h
+++ b/src/s/irix6-5.h
@@ -96,3 +96,10 @@ char *_getpty();
 /* Tested on Irix 6.5.  SCM worked on earlier versions.  */
 #define GC_SETJMP_WORKS 1
 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
+
+
+/* DATA_SEG_BITS forces extra bits to be or'd in with any pointers which
+   were stored in a Lisp_Object (as Emacs uses fewer than 32 bits for
+   the value field of a LISP_OBJECT).  */
+#define DATA_START 0x10000000
+#define DATA_SEG_BITS   0x10000000