Kernel compilation problem

[freebsd2 at freesurf.fr]

Hi all!
I'm very new to FreeBSD (indeed I ran it since one week) and I need to
compile my kernel so that some patches will apply correctly.
So I made all the process I type make depends && make and I've got sth like
this:
../../../i386/i386/genassym.c:216:error: storage size of BC32SELw0 isn't
known
I've got that for all BC32 and furthermore on line 214 for KSPEL :(
So the compilation stops on an error code.
Does anyone got a clue?
Many thx :)