The win/pkg.vc file has still an old version number which leads to wrong installation directory.

Patch is:

--- 2001-09-18 18:53:09 +0000
+++ 2018-05-16 16:36:24 +0000
@@ -6,5 +6,5 @@
 #  $Id: pkg.vc,v 1.4 18:53:09 smithc Exp $
 ######################################################################

-IWIDGETS_DOTVERSION	= 4.0.1
+IWIDGETS_DOTVERSION	= 4.1.1
 IWIDGETS_VERSION	= $(IWIDGETS_DOTVERSION:.=)

Diff finished.  Wed May 16 18:36:29 2018