Install libflowcanvas-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libflowcanvas-dev
Description:
interactive widget for “boxes and lines” environments - header files
FlowCanvas is an interactive Gtkmm/Gnomecanvasmm widget for “boxes and lines” environments (ie modular synths or interactive finite state automata diagrams). . This package provides the development files.
Homepage: http://drobilla.net/software/flowcanvas/
Version: 0.7.1+dfsg0-0.4build1
Section: universe/libdevel