new FAQ entry: several Qt versions(was: Re: Ghost points in small app & question about using qt 2.0.1 libs.)

[Joachim Ansorg]

Hi!

I use export QTDIR=<new QT version> and this will work without using the links.

--Joachim

>Jeremy Webster wrote:
>>     One other question.  Now that I have all the qt 1.44 libs working, how
>> do I make it so that I can also use the qt 2.0.1 libs?  I was going through
>> some of the toots over at Qt and they seem to really like qvbox.h and some
>> other things that apparently aren't in the 1.44 set.   I tried fiddling
>> around in the Project Options menu with no success.  Is any of this
>> documented anywhere?
>
>Q: I want to develop with a newer Qt version than provided
>   with my current Unix distribution. How do I do that?
>A: Some things has to be done:
>   1.) The newer Qt version must be installed parallely.
>       [ For instance like this: /usr/lib/qt-1.44
>                                 and
>                                 /usr/lib/qt-2.0.2  ]
>   2.) The compiler looks in /usr/local/qt or /usr/lib/qt 
>       while deciding for the right headers of a Qt library.
>       The link
>          /usr/local/qt --> /usr/lib/qt
>       is set in most of all cases.
>
>       That's why you just need to set one of these links 
>       to tell the compiler what to choose:
>          /usr/lib/qt --> /usr/lib/qt-2.0.2
>            (for compiling Qt2 programs)
>          /usr/lib/qt --> /usr/lib/qt-1.44
>            (for compiling Qt1.44 programs)
>
>       The command for setting the link is:
>          ln -s /usr/lib/qt /usr/lib/qt-2.0.2
>       or
>          ln -s /usr/lib/qt /usr/lib/qt-1.44
>
>   3.) To make sure that the linker find the right lib simply 
>       switch to user "root" and add two lines in /etc/ld.so.conf :
>          /usr/lib/qt-2.0.2/lib
>          /usr/lib/qt-1.44/lib
>       and run:
>          /sbin/ldconfig -v
>
>-- 
>
>Ciao,
>--Falk
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