And to fix cppressdk here: https://github.com/microsoft/cpprestsdk/blob/master/Release/cmake/cpprest_find_boost.cmake#L49

Sure there might be permutations of this depending on the target platform and similar. But just to confirm, it failed to find boost (specificly Boost::system) and removing Boost::system from the file fixed it?

Just to clarify, I'm the maintainer of the FreeBSD port now, and I at least intermittently observed issues that were solved by the original patch while trying to build for the new FreeBSD 15.0 in december.

But just to confirm, it failed to find boost (specificly Boost::system) and removing Boost::system from the file fixed it?

Yes. Because boost_system is header only since a while (1.69) and the stub lib is now removed as you said.

Yes, if you want me to add it to the PR, could you perhaps provide error messages for verification? Which platform are you building for?

Linux Gentoo boost-1.89.0 cmake-4.2.1:

- Found websocketpp version 0.8.2 on system
CMake Warning (dev) at Release/cmake/cpprest_find_boost.cmake:49 (find_package):
  Policy CMP0167 is not set: The FindBoost module is removed.  Run "cmake
  --help-policy CMP0167" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

Call Stack (most recent call first):
  Release/cmake/cpprest_find_websocketpp.cmake:17 (cpprest_find_boost)
  Release/src/CMakeLists.txt:68 (cpprest_find_websocketpp)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Error at /usr/lib64/cmake/Boost-1.89.0/BoostConfig.cmake:141 (find_package):
  Could not find a package configuration file provided by "boost_system"
  (requested version 1.89.0) with any of the following names:

    boost_systemConfig.cmake
    boost_system-config.cmake

  Add the installation prefix of "boost_system" to CMAKE_PREFIX_PATH or set
  "boost_system_DIR" to a directory containing one of the above files.  If
  "boost_system" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  /usr/lib64/cmake/Boost-1.89.0/BoostConfig.cmake:262 (boost_find_component)
  /usr/share/cmake/Modules/FindBoost.cmake:610 (find_package)
  Release/cmake/cpprest_find_boost.cmake:49 (find_package)
  Release/cmake/cpprest_find_websocketpp.cmake:17 (cpprest_find_boost)
  Release/src/CMakeLists.txt:68 (cpprest_find_websocketpp)

Thanks. With boost-1.89 unmasked I guess. I'll probably be able to reproduce it as I am using Gentoo as well.

Also testing replacing deadline_timer (header not included, also deprecated) with steady_timer:

/var/tmp/portage/dev-cpp/cpprestsdk-2.10.19-r8/work/cpprestsdk-2.10.19/Release/src/http/client/http_client_asio.cpp:470:18: error: ‘deadline_timer’ in namespace ‘boost::asio’ does not name a type
470 | boost::asio::deadline_timer m_pool_epoch_timer;
| ^~~~~~~~~~~~~~

With regards to Gentoo Linux I'm testing an updated patch for dev-cpp/cpprestsdk::guru . I have the changes staged locally so just test building with boost-1.88 now. I expect to commit the changes if they work with 1.88 as well within the next 24hrs to the guru dev-branch.