configure error on cvs tip - Mailing list pgsql-hackers

I just sync'd up with cvs and tried to make clean then configure, and I'm 
getting this:

config.status: linking ./src/backend/libpq/v6util.c to 
src/interfaces/libpq/v6util.c
config.status: error: ./src/backend/libpq/v6util.c: file not found

Is this a missing file from the ipv6 stuff that just got committed?

Thanks,

Joe