xkaraman left a comment (kamailio/kamailio#4578)
In `cmake` we use the
[FindLua](https://cmake.org/cmake/help/latest/module/FindLua.html) module
`find_package(Lua)`, which will discover the most recent and available
liblua5.x-dev. A version can also supplied to require that one like
`find_package(Lua 5.3)` and it will accept only compatible versions. One can
also provide the path to it by using the
[Lua_ROOT](https://cmake.org/cmake/help/v3.23/variable/PackageName_ROOT.html)
but this is probably more for custom install paths since system installed will
probably already be discovered. Or provide the necessary variables like
`LUA_INCLUDE_DIR` to detect it.
I see two options regarding cmake.
1. Build each version with a new configuration providing the the include dir
like `-DLUA_INCLUDE_DIR=/usr/include/lua5.2` to detect the 5.2 version and then
build the target app_lua. minimal to no cmake changes, but the module name will
be the same, will need to find way to rename it from package perspective.
2. Try to implement something in its `CMakeLists.txt` with an option of list of
version to be build if the libraries versions is installed.
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