don't run regress tests by default
diff --git a/Makefile b/Makefile
index 103d8cd..865f3fb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,7 @@
-SUBDIR = libexec got tog regress
+SUBDIR = libexec got tog
+
+.if make(regress)
+SUBDIR += regress
+.endif
.include <bsd.subdir.mk>