Install libgtksourceviewmm-3.0-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libgtksourceviewmm-3.0-doc
Description:
C++ binding of GtkSourceView
GtkSourceViewMM is a C++ binding of GtkSourceView, an extension to the text widget included in GTK+ 3.x adding syntax highlighting and other features typical for a source file editor. . GtkSourceViewMM is crafted to integrate well into applications using the gtkmm framework. . These are the reference documentation for libgtksourceviewmm.
Homepage: http://www.gtkmm.org/
Version: 3.18.0-3
Section: universe/doc