how to detect Qt3 ahd Qt4 with qmake?

[learning_qt]

Sorry , for confusion
The idea is:
My application need Qt4.6 and some computers have Qt3, Qt4.4.3 and Qt4.6. So, are there some ways in Qmake or project file to detect if Qt4.6 is installed? if so, we get the header files path automatically so makefile can use this path in -I/usr/local/...?

Thanks in advance!

[DrDonut]

If you use Qmake from the command line, I would assume that it would take the header files from the directory QMake itself is in. For example you call:

C:\QT\4.6\bin\make.exe

C:\QT\4.6\bin\make.exe

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That qt automaticly uses the header files from: C:\QT\4.6\include...

But I don't know how those files are stored in a linux system which you seem to be using (I only program using Windows).

So maybe you can try this, and maybe someone else around here knows more about that.

Good luck!

[learning_qt]

Thanks!

I hope to add some into project file so that QMake can detect which version of Qt is installed and where it is?