Hi, I'm rebuilding SyncEvolution 1.5.3 under Fedora Rawhide (to be Fedora 33), which has boost 1.73.0 and this boost version has changed behavior of the bind.hpp, as shown in the build log: In file included from /usr/include/boost/bind.hpp:30, from ./src/syncevo/GLibSupport.h:41, from src/syncevo/ForkExec.h:30, from src/syncevo/ForkExec.cpp:20: /usr/include/boost/bind.hpp:36:1: note: '#pragma message: The practice of declaring the Bind placeholders (_1, _2, ...) in the global namespace is deprecated. Please use <boost/bind/bind.hpp> + using namespace boost::placeholders, or define BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.' 36 | BOOST_PRAGMA_MESSAGE( The above is only a message, which leads to a build break later in the sources: src/syncevo/Cmdline.cpp: In member function 'bool SyncEvo::Cmdline::run()': src/syncevo/Cmdline.cpp:1426:65: error: '_1' was not declared in this scope 1426 | processLUIDs(source, boost::bind(ShowLUID, logging, _1)); Declaring the BOOST_BIND_GLOBAL_PLACEHOLDERS mutes the message, but it doesn't fix the build. I'd propose a patch, but I do not know a single bit of the boost library. I'm sorry. Bye, Milan