diff --git a/Makefile.in b/Makefile.in
index 4b40d8741d4..e6c337385a7 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -427,6 +427,10 @@ epaths-force-ns-self-contained: epaths-force
 	  -e 's;${ns_appdir}/;;') &&			\
 	${srcdir}/build-aux/move-if-change epaths.h.$$$$ src/epaths.h
 
+ifneq ($(NTDIR),)
+$(NTDIR): lib
+endif
+
 lib-src src: $(NTDIR) lib
 
 src: lib-src