Here's a port for LyX 1.6.2, which was released this week. Tested on i386.
Unfortunately, the spell checker window bug is still there. If a new and empty document is created and the spell checker is called through the tool bar or the menu bar, the spell checker's window isn't mappe/closed properly. At least if your window manager is cwm, dwm or twm. I can't reproduce this behaviour with fvwm and mwm. This bug might be related to L<http://bugzilla.lyx.org/show_bug.cgi?id=2218#c15>. Apart from this problem LyX 1.6.2 seems to work fine. LyX 1.6 requires Qt 4. XForms is no longer supported. The port depends on the boost package from the ports tree instead of the included boost sources. patch-configure is gone. The port for 1.6.2 adds a new patch and the compiler flag -fno-inline to work around bugs in g++ 3.3.
lyx-1.6.2.tar.gz
Description: OpenBSD port of LyX 1.6.2