Sorry to chime in back so late, I had several hiccups with my mail lately, and
most (if not all) of your messages simply remained in transit until today.
As far as I have experimented, a single version of Qt is allowed to be
installed. Fair enough.
I’ve rewritten the Qgis3 port introducing a +qt59 variant. I think what can be
done could be something like:
Variant qt59 conflicts … {
depends-lib-append qt59- (list of libraries)
}
using explicit qtXX- dependencies.
Or, if we want to spare space:
Variant qtXX conflicts qtYY … {
set qt_version XX
}
…
Depends-lib_append qt${qt_version}-…
The port group could be modified to check variants are compatible with MacOS X
versions, so e.g. requesting Qt 5.9 on Snow Leopard would result in an error.
Vincent
