To install D++ from XBPS source packages collection, follow the step below (as root):

xbps-install -Sy dpp-devel

This will install D++ development files and related libraries

You will now be able to use D++ by including its library on the command line:

g++ mybot.cpp -o mybot -ldpp

Note: Compiling your bot with a raw g++ command is not advised in any real project, and the example above should be used only as a test. From here, you should learn to create a bot in D++ by moving on to Building a Discord Bot Using CMake (UNIX) or if you have not yet created a token for your bot, Creating a Bot Token - If you are having trouble setting up CMake, you can try our template cmake bot project.