CodeLite IDE

how to switch between gtk2 and gtk3 while using wxWidgets?

I am not sure what do you mean by "switching between gtk2 and gtk3"
If you mean, that you want to build your code using GTK2 and GTK3, then you will need to create 2 different build configurations in CodeLite
In the project settings->compiler and project settings->linker, change occurrences of wx-config to the proper wx-config. You should have a wx-config per wxWidgets build (e.g. one for GTK2 and one for GTK3)

And for Debian and Debian-derived Linux distributions e.g. Ubuntu or Linux Mint you should use: and choose the appropriate version.

thanks