Install libgarcon-gtk3-1-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgarcon-gtk3-1-dev
Description:
Development files for garcon-gtk3
This package contains the headers and the static library for garcon-gtk3 library, the GTK3 support library for the garcon menu library.
Homepage: http://www.xfce.org/
Version: 0.6.1-2
Section: universe/libdevel