Just to let you know that I encountered some issue when installing Asterisk 1.4 from svn.
Since update from svn worked fine, I think that the Makefile in zaptel/firmware is not working properly and fails downloading firmware from ftp.digium.com/pub/telephony/firmware/releases/ while wget is installed on my system.
SVN : 2146
I juste downloaded the firmware files from ftp.digium.com/pub/telephony/firmware/releases/ in /zaptel/firmware, gunzip and tar xvf before doing a make install from /zaptel to have it working. 