configure: error: C compiler cannot create executables

[Jesse Gooch]

Hi,

I'll spare you a scolding for trying freebsd-update with a custom kernel
installed! On a production server to boot! We all make mistakes though.

Have you tried rolling back with freebsd-update? I've had similar
problems, and I just rolled back and built world from source. This was a
while ago so my memory is a little hazy though. Read the man page for
freebsd-update for more info on rolling back.