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-rw-r--r--src/s/msdos.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/s/msdos.h b/src/s/msdos.h
index a62aa66929e..6ee4d3c37ea 100644
--- a/src/s/msdos.h
+++ b/src/s/msdos.h
@@ -112,6 +112,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define BSTRING
+/* Define this is the compiler understands `volatile'. */
+#define HAVE_VOLATILE
+
+
/* subprocesses should be defined if you want to
have code for asynchronous subprocesses
(as used in M-x compile and M-x shell).