VIM3 Cross-compile environment on user application

Dear, Khadas team.
I am trying to make a user application of QT5 Base using VIM3(ubuntu).
The application, used in other solutions, needs to be ported to VIM3. So I want to configure the cross compile environment.
The Application used C, C++, QT5’s Gcc G++ Cross compile environment.
Do you have any data or reference on the simple CrossCompile configuration of Makefile base in VIM3?