Install libpangomm-1.4-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libpangomm-1.4-doc
C++ Wrapper for pango (documentation)
Pangomm is a C++ wrapper for the pango library. Originally part of gtkmm, pangomm provides convenient C++ interfaces for handling both the layout and internationalization of text in graphical applications. . This package contains the documentation.