Line 22 of /opt/local/var/macports/build/_opt_local_var_macports_sources_release_tarballs_ports_multimedia_mkvtoolnix/mkvtoolnix/work/mkvtoolnix-39.0.0/src/common/json.h says:įrom what I have been able to learn just now, this is called a compact namespace, and is a new feature in C++17.

Maybe this parse error is a problem in Qt that was resolved after 5.8.0. I am on macOS 10.13 and therefore using Qt 5.12.5. You are on OS X 10.9 and are therefore using Qt 5.8.0. But looking around on Google now, I see others reporting moc error messages that look just like that, so the missing leading and trailing characters must be a bug in how moc prints error messages. is missing the leading / and the trailing h. It is weird that opt/local/var/macports/build/_opt_local_var_macports_sources_release_tarballs_ports_multimedia_mkvtoolnix/mkvtoolnix/work/mkvtoolnix-39.0.0/src/common/json.

:info:build opt/local/var/macports/build/_opt_local_var_macports_sources_release_tarballs_ports_multimedia_mkvtoolnix/mkvtoolnix/work/mkvtoolnix-39.0.0/src/common/json.:22: Parse error at 'mtx' Ilib -Ilib/avilib-0.6.10 -Isrc -Ilib/utf8-cpp/source -DSYS_APPLE -nw src/mkvtoolnix-gui/app.h > src/mkvtoolnix-gui/app.moc :info:build /opt/local/libexec/qt5/bin/moc -I/opt/local/libexec/qt5/include/QtWidgets -I/opt/local/libexec/qt5/include -I/opt/local/libexec/qt5/include/QtMultimedia -I/opt/local/libexec/qt5/include -I/opt/local/libexec/qt5/include/QtGui -I/opt/local/libexec/qt5/include -I/opt/local/libexec/qt5/include/QtNetwork -I/opt/local/libexec/qt5/include -I/opt/local/libexec/qt5/include/QtConcurrent -I/opt/local/libexec/qt5/include -I/opt/local/libexec/qt5/include/QtCore -I/opt/local/libexec/qt5/include -I. I see in the log that every time moc is run, it has a problem with a json header:

Mkvmerge gui 5.8.0