arla compiling

[Magnus Ahltorp]

> krbafs is a library designed allow you to compile Arla if you have MIT
> Kerberos installed.  "Des_cblock" and "CREDENTIALS" are types found in
> krb.h (the Kerberos v4 header).  You need to run krbafs's configure
> again with the "--with-krb4=<dir>" option and "<dir>" as the location
> of your MIT Kerberos installation.

On Mac OS X, I use --with-krb4=/foobar where /foobar is some directory
that doesn't exist, and then it uses the built in MIT Kerberos.

/Magnus