[syslog-ng] syslog-ng 3.8 how to get configure script

I wanted to start using elasticsearch 2.2 so need to start using syslog-ng 3.8 but there is no configure script in the master branch. autoconf returns a bunch of "possibly undefined macro" errors and leaves a non-working configure script. autoreconf does similar things. Can anyone give me some help on getting a working configure/make setup for syslog-ng 3.8 I am attempting this on Redhat 6. Evan.