diff --git a/make.h b/make.h
index 3f35cbd4..42fe9002 100644
--- a/make.h
+++ b/make.h
@@ -22,6 +22,11 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include <stdio.h>
 #include <ctype.h>
 #include <time.h>
+#include <errno.h>
+
+#ifndef	errno
+extern int errno;
+#endif
 
 #ifdef	HAVE_UNISTD_H
 #include <unistd.h>