-I order

[Per Starback]

When I built openssh 2.5.1p2 on AIX it included /usr/local/include
for me.  That's in configure:

        case "$host" in
        *-*-aix*)
        	AFS_LIBS="-lld"
        	CPPFLAGS="$CPPFLAGS -I/usr/local/include"
                [...]

Then when including "config.h" in openbsd-compat/openbsd-compat.h
that found some old /usr/local/include/config.h I had instead of
the config.h that it meant to use.  I suggest using another order for
those -I arguments.