Install libgtkmm-3.0-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgtkmm-3.0-dev
Description:
C++ wrappers for GTK+ (development files)
Gtkmm is a C++ interface for the popular GUI library GTK+, API version 3.0. Gtkmm provides a convenient interface for C++ programmers to create graphical user interfaces with GTK+'s flexible OO framework. Highlights include type safe callbacks, widgets extensible using inheritance and over 180 classes that can be freely combined to quickly create complex user interfaces. . This package contains development files and examples, as well as a gtkmm-demo program.
Homepage: http://www.gtkmm.org/
Version: 3.22.2-2
Section: libdevel