Install libgucharmap-2-90-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgucharmap-2-90-dev
Description:
Unicode browser widget library (development headers)
The libgucharmap library contains a Unicode browser widget; it is most prominently used by the "gucharmap" program. See the package of the same name for more information. . This package contains the development headers.
Homepage: https://wiki.gnome.org/Apps/Gucharmap
Version: 1:10.0.4-1
Section: universe/libdevel