For the future the plan is to use cmake-based building system, which is already in git master branch:
- https://www.kamailio.org/wikidocs/tutorials/cmake/
The old-makefiles are obsoleted and should be used only for very old distros, where cmake version is not compatible with what is needed for kamailio in a simple way.
Otherwise, this change is quite intrusive, is this the only way to get it done? I would expect a lot of projects using directly makefiles to be affected. Maybe some option to `make` command to behave like before?!?