[Samba] Samba 4 will not start after new checkout

[steve]

Version 4.0.0alpha18-GIT-e75c436
Ubuntu 11.10 Built now with

make clean
./configure.developer
make
make install

samba -i -d3 gives this:

ldb: unable to stat module ${PREFIX}/modules/ldb : No such file or directory
ldb_wrap open of privilege.ldb
samba: using 'standard' process model
Unknown process model 'standard'

my $PREFIX should be /usr/local/samba I think.  The path is there and I 
can export PREFIX="/usr/local/samba" but nada.  Also, what about Unknown 
process model 'standard'.
Can anyone help?

Thanks
Steve