Install libgtk2.0-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgtk2.0-dev
Description:
development files for the GTK+ library
GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites. . This package contains the header files and static libraries which are needed for developing GTK+ applications.
Homepage: http://www.gtk.org/
Version: 2.24.32-1ubuntu1
Section: libdevel