we will relelase another beta within the next few days, so you have two choices:

 * waiting the next beta release

 * check our build process in one of our docker image [1], [2]

(you can get a list of dependencies which needed for building syslog-ng, and configure options, etc...)

Links:

[1] https://github.com/balabit/syslog-ng-docker

[2] https://registry.hub.docker.com/repos/balabit/

regards,

Laszlo Budai