libsynchronization.a preset in mingw-w64. Please check your installation. See mingw-w64-crt/Makefile.am[1].
[1]: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/Makefile.am _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
