When using the current Cygwin CMake package (3.31.3), CMake fails to detect an installed Boost 1.66 installation. This issue appears to be caused by an upstream change introduced around CMake 3.30, where find_package(Boost) now prefers Config mode over the legacy Module mode (FindBoost.cmake).
Since Boost 1.66 does not provide a BoostConfig.cmake, CMake 3.31.3 assumes that Boost is not installed, even though the libraries are actually present. As far as I understand, this is an expected upstream behavior rather than a Cygwin packaging bug. However, for users still depending on older Boost versions, it may cause unexpected detection failures. Upgrading Boost to version 1.70 or later (which provides BoostConfig.cmake) is therefore recommended. I’m aware that the Boost package currently has no active maintainer, but I wanted to document this behavior in case others encounter the same issue. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
