Install libace-flreactor-6.4.5 by entering the following commands in the terminal:
sudo apt update sudo apt install libace-flreactor-6.4.5
Description:
ACE-GUI reactor integration for FLTK
Recognizing the need to write reactor-based GUI applications, the ACE community has created several reactor extensions for use with X Window System. Each of these extends the ACE_Select_Reactor to work with a specific toolkit. By using these reactors, your GUI application can remain single threaded yet still respond to both GUI events, such as button presses, and your own application events. . The ACE_FlReactor integrates with the FastLight toolkit's Fl::wait() method.
Homepage: http://www.dre.vanderbilt.edu/~schmidt/ACE.html
Version: 6.4.5+dfsg-1build2
Section: universe/libs