diff --git a/Makefile b/Makefile
index 76c7af46..7ac617f3 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ install: all
 	(./mkdir.sh  $(INSTALL_LIBDIR) &&\
 	   $(INSTALL_DATA) lib/*.a  $(INSTALL_LIBDIR))
 	(./mkdir.sh  $(INSTALL_INCLUDEDIR) && \
-	   $(INSTALL_DATA) lib/*$(.mod) $(INSTALL_INCLUDEDIR))
+	   $(INSTALL_DATA) Make.inc lib/*$(.mod) $(INSTALL_INCLUDEDIR))
 	(./mkdir.sh  $(INSTALL_DOCSDIR) && \
 	   /bin/cp -fr docs/*pdf docs/html $(INSTALL_DOCSDIR))
 clean: