Set up KDevelopment for use with C/C++ FLTK Help

[Integer123]

Just installed mint.
I installed KDevelopment and was successful compiling a Terminal C++ Hello World program.
The Setup to compile GUI's with the FLTK UI is fleeting.
I ended up installing CMake to make the terminal app work.
Anyone know how to set up FLTK for use in KDevelopment?
Need like an install order and list to make things work.
Keep getting Cmake errors. I'm sure its something I've not set up or understand.
I did the Get more templates thing.
I think I'm missing FLTK so I downloaded it. Have not compiled it yet. Not sure where to make the install!
Have a folder named projects in my Home Directory.
Not sure where I should install it.
Any getting started help would be appreciated.
I'm new and both not new to Linux. I've installed it probably 100 times but really never got into using it.
But I've decided to give it a good tire kicking this time. I hate what Microsoft has become!
I searched for Setup C/C++ KDev FLTK on here but wow the number of returns on that is pretty daunting! 53,173
Anyway any help is appreciated! I'll name my first variable after you!
Links with how to's appreciated.

[AndyMH]

VScode (or vscodium) as an alternative?
https://code.visualstudio.com/docs/cpp/config-linux

[Integer123]

Thanks.

[Integer123]

That was really easy with the VS Code thanks!!!

[AndyMH]

It's what I use for C++ (arduino).

Note a couple of extensions worth installing - print converts your source file into html opens your browser ready to print it, and save button - adds a save icon to the tabs at the top, easier than file > save if you are not in the habit of ctrl-S.