[App_rpt-users] asl source code

I just setup an ASL image for the Stretch distro. I have been running DIAL for some time with good results. I delayed making this upgrade because I have quite a few of my own tweaks and tools installed. It has been easier to just clone my image for new nodes. Part of what I've been doing requires edits to app_rpt.c and recompiling. This has always been easy to do through the from the earlier CentOS through the DIAL releases. When I looked for the directory with source code, I was surprised to not find it. Is there a detailed "how to" documented step by step procedure posted somewhere on installing source and make/recompile files? I don't want to break what I now have working with the new ASL. Thanks, Tom / K5TRA