Qt 6.1 (macOS) broke compiler configuration

[Christoph Schmitz]

After updating to Qt 6.1 the .\configure script fails (on both x86 and ARM64 platforms):

These are the last messages:

checking for pkg-config... /usr/local/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for qmake-qt6... no
checking for qmake6... qmake6
checking for Qt6... yes
checking for QtGui/qtgui-config.h... yes
checking for QtGui/private/qtgui-config_p.h... no
checking whether Qt uses the X Window system... no
checking for moc... no
checking for moc-qt6... no
checking for moc6... no
checking for moc... no
configure: error: cannot find moc binary.

Any recommendation how to tackle this issue?

Chris