Do you mean directly from 3.7->4.3? if so.. that's unsupported...
MD5 (/usr/local/lib/libintl.so.4.0) = 23eff988beabaad67ea750910724cc4e
It's part of the
devel/gettext port..
Again, what you're doing is unsupported... it would be much easier to do a clean installation.
"Note: Upgrades are only supported from one release to the release immediately following it. Do not skip releases."
http://www.openbsd.org/faq/upgrade43.html