Install libace-xtreactor-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libace-xtreactor-dev
Description:
ACE-GUI reactor integration for Xt - development files
This package contains header files and static library for the ACE-Xt reactor integration.
Homepage: http://www.dre.vanderbilt.edu/~schmidt/ACE.html
Version: 6.4.5+dfsg-1build2
Section: universe/libdevel