#44193: qt: allow side by side installation of qt4-mac and qt5-mac -------------------------------+------------------------ Reporter: mojca@… | Owner: mcalhoun@… Type: enhancement | Status: new Priority: Normal | Milestone: Component: ports | Version: Resolution: | Keywords: Port: qt4-mac, qt5-mac | -------------------------------+------------------------ Comment (by rjvbertin@…): * It's very likely that KF5 will require a Qt5 install with specific patches that we may not want to impose on everyone. Ports cannot depend on a variant, so in that case a dedicated port will be required. I agree that's a much stronger argument for a dedicated port than simply the install layout. * There is no question of maintaining 2 variants of all dependents. Proper configuration of the PortGroup will ensure that ports that do not have a hard requirement on the one or the other (and thus a conflict with the other or the one) will build with all Qt ports. There could be 1 or 2 corresponding variants that act as a protection against installing the wrong binary build, but that's handled purely in the PortGroup, and maintained by the qt*-kde maintainer (which I reckon would be me). I've been very clear I think that there is absolutely no reason to change more to the current install layout than strictly necessary, and good reasons to *not* to do that ''*)''. It seems Mojca agrees with me; maybe we should invite opinions from more "core" MacPorts developers who are maybe more likely to provide additional arguments based on MacPorts guidelines. ("Follow Linux/Freedesktop/XDG conventions" , "avoid duplicating directory structures", etc.) I'm compelled to come back one last time to my suggestion to commit my qt4 -mac-devel (which wouldn't even "destroy" the existing qt4-mac-devel; that one was very obsolete last time I looked). Mojca voiced concerns about repeated and expensive rebuild cycles, and I understand that we're now facing pressure to "get through with it already" because of 10.11's imminent release. I cannot really imagine that there will be many early updaters who are on old hardware where building Qt is an issue. Providing an up-to-date qt4 -mac-devel will give the other early updaters a working solution that may even be replaced by a drop-in replacement qt4-mac port in the end. And that wouldn't exclude applying the 10.11 patch to the current port (without even rev-bumping it; not required for users who do not already have an installed version). ''*) I do realise that I should have kept a record of the issues I identified while experimenting with an all-encompassing install prefix myself.'' -- Ticket URL: <https://trac.macports.org/ticket/44193#comment:73> MacPorts <https://www.macports.org/> Ports system for OS X