Not missing, I think - some sorts of mis-matches
somewhere. The constants/variables were
either re-named, or they were #defines that
were changed and referenced other things
that weren't visible, or stuff like that.

Anyway, going back to 2.4 (both kernel and
headers) resolved the subversion compile, and
I just used the ndiswrapper that I had compiled
under 2.6, which solved the issue that had made
me switch to 2.6 to begin with.