Shows how to create a check button with Fl_Check_Button widget.
To build this project, open "Terminal" and type following lines:
mkdir build && cd build
cmake ..
start Check_Button.sln
Select Check_Button project and type Ctrl+F5 to build and run it.
mkdir build && cd build
cmake .. -G "Xcode"
open ./Check_Button.xcodeproj
Select Check_Button project and type Cmd+R to build and run it.
mkdir build && cd build
cmake ..
cmake --build . --config Debug
./Check_Button