In CMakeLists.txt scripts, it is customary to have a: cmake_minimum_required(VERSION x.y) for the appropriate x.y version number. But how can I tell what that minimum version is? I don't wor...

In particular, I'd like to check the amount of RAM installed on the PC. If it's less than 1GB, I'd like to show a warning message before/during the installation...

Is there a way to evaluate the minimum requirements of a software? I mean, how can I discover, for example, the minimum amount of RAM that my application will need? Thanks!