Install libgxwmm-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgxwmm-dev
Description:
Guitarix - GTK+ C++ widget library (development files)
Guitarix is a rock guitar amplifier for the Jack Audio Connection Kit with one input and two outputs. It is designed to produce nice trash/metal/rock/blues guitar sounds and comes with a GTK+ interface and as Ladspa and LV2 plugins. . This package contains development files for Guitarix's GTK+ C++ widget library.
Homepage: https://guitarix.org
Version: 0.36.1-1
Section: universe/libdevel