[Info-vax] GTK and/or up-to-date OpenVMS Porting Library for IA64?

[SMS]

   I was trying to do something useful on an IA64 system (VMS
V8.3-1H1), when I noticed that I hadn't rebuilt Vim since I
copied things over from an Alpha system.  So, I tried to build
Vim, but that failed because I hadn't rebuilt GTK either.  So,
I tried to build GTK, but that failed because the kit I have
("GTK+ Version 1.2.10-A1 for OpenVMS Alpha") has conflicts
between the VMS_JACKETS.H and the IA64 system header files.
(For example, realpath() causes spewage of %CC-W-MISPARAMCOUNT
and %CC-E-NOTCOMPAT.  I stopped there.)

   I'd guess that there's a GTK kit more modern than the only
one I've found so far:

   http://www.openvms.compaq.com/openvms/products/ips/gtk.html

or an OpenVMS Porting Library kit more modern than the only
one I've found so far:

   http://www.openvms.compaq.com/openvms/products/ips/porting.html

Suggestions (other than "Stay on Alpha.")?