This is an extra check that's only needed for working around Linux
distribution packaging. `moc` is not required in the cross file.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/640>
# that it's installed.
# We don't do this check on other OSes because they need to be able to simply
# point the `QMAKE` env var to `qmake` to build against a particular Qt5.
-if host_system == 'linux'
+if host_system == 'linux' and not meson.is_cross_build()
moc = find_program('moc-qt5', 'moc', required : qt5_option)
else
# We only check if `moc` was found, and then discard it, so we can fake it.