I am not sure if this is related: https://github.com/boostorg/signals2/pull/8/files
When i was updating my build environment a few days ago i had to apply this patch to boost 1.5.7 to make it work with widelands. -- https://code.launchpad.net/~widelands-dev/widelands/seafaring-ai/+merge/242271 Your team Widelands Developers is subscribed to branch lp:~widelands-dev/widelands/seafaring-ai. _______________________________________________ Mailing list: https://launchpad.net/~widelands-dev Post to : widelands-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~widelands-dev More help : https://help.launchpad.net/ListHelp