It's probably best to explicitly say "commonly used components" to be clear about what these values are.
I don't understand what this entry is -- is it helpers *for* additional CMake modules, or additional CMake modules that are helpful, or ...?
Try to avoid if/then sentences. Occasional use is okay, but still, try to avoid. Often just rearranging them gets rid of the if/then and pause:
Applications depending on LXQt should set
Below, it just says "Available LXQt Components". Isn't that all of them? If it is, this can just say "...a list of needed components from the table below."