Cyrus won't build without Kerberos?

[Christopher Smith]

checking for des_ecb_encrypt in -ldes... yes
checking for Kerberos includes...
checking for krb.h... no
configure: warning: No Kerberos V4 found
configure: error: Kerberos not found for authorization module

Okay, I actually do have Kerberos installed, but that's beside the 
point. I'm trying to do a build with 2.1.8 without Kerberos. Is the 
configure script broken or something?

--Chris