[Qt-interest] Switching Qt Installation

[Frank Neuhaus]

On Tue, Oct 13, 2009 at 11:04 AM, Stephen Jackson <spjackson42 at gmail.com> wrote:
> On Mon, Oct 12, 2009 at 8:41 AM, Frank Neuhaus wrote:
>> Hi,
>>
>> I installed Qt 4.5.2. with my Linux Distribution (Fedora)'s packet
>> manager. Now I want to compile the latest git version of Qt creator,
>> which unfortunately requires 4.6.0. I downloaded the 4.6.0 tech
>> preview edition, compiled and installed it. It installed into
>> /usr/local/Trolltech/Qt-4.6.0-tp1/.
>> The problem is that even when explicitly calling
>> /usr/local/Trolltech/Qt-4.6.0-tp1/bin/qmake, qmake generates Makefiles
>> that include /usr/include/QtSomething, which obviously belong to my
>> old Qt 4.5.2 installation. Environment variables such as QTDIR appear
>> to be ignored.
>> How can I tempoarily change my installation to 4.6.0 to compile Qt creator?
>>
>
> I haven't used 4.6 or tried to compile Qt Creator. However, specifying
> the path to qmake (or setting PATH) is all I need to do to switch
> between Qt versions for building application code. As I understand it,
> that is all you are supposed to do.
>
> If that isn't working for you (as you indicate above), I suggest that
> you check whether this is something specific to building Qt Creator,
> and also whether you have any environment variables pointing at
> /usr/include/QtSomething. Do you run "configure" for building Qt
> Creator? Is that where it is going wrong?
>
> I hope this gives you some clues.

Thanks for your reply.

I believe the problem is not specific to Qt Creator. Its a "standard
Qt program", i.e. it doesn't require configure or anything. Just qmake
followed by make suffices.
What do you mean with specifying the path to qmake? My /usr/bin
contains a symbolic link to my 4.5.2 qmake... Even when i exchange
that link by a link to the 4.6 qmake, it does not work. That is - the
proper qmake is called when I type qmake (checked that with qmake -v),
but it keeps using the include directories in /usr/include/QtGui and
so on. I can see that when I type make and I look at the actual
compiler calls - they contain -I/usr/include/QtGui etc.

How does qmake determine which include directories to use?

Thanks again
   Frank