libxmlrpcpp-dev - 1.15.9+ds1-7+deb11u1 main

This package is part of Robot OS (ROS). It contains the development
files for the XmlRpc++ library, which is a C++ implementation of the XML-RPC
protocol. This version is heavily modified from the package available
on SourceForge in order to support roscpp's threading model. As such,
it's a maintained fork by OSRF.