How to use a library (LAPACK) with Qt? (Windows)

[Skywalker]

This is a real beginner question - I've never used Qt on Windows before. I want to use the LAPACK library with Qt. I've placed "LIBS += -llapack" in my .pro file, but how do I get Qt to know where the LAPACK library is located?

I have Vista 64.

[conrad10781]

Assuming that the library name is right... You don't have to do anything if the library is in your windows PATH. Otherwise you will have to use -L to tell Qt where it is located

[giusepped]

You have to set the DEPENDPATH and the INCLUDEPATH in your .pro.

[Skywalker]

Thanks. I installed LAPACK for Windows, and have the text below as part of my .pro file. But the compiler still can't find -llapack. What's my mistake?

DEPENDPATH += .
DEPENDPATH += C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\lib\x64
INCLUDEPATH += .
INCLUDEPATH += C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\lib\x64

[jpn]

Try something like this:

INCLUDEPATH += "C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\include
LIBS += -L"C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\lib\x64" -llapack

[Skywalker]

Thank you very much, that worked.

Is there a way to conditionally include that in the .pro file, so that the same .pro file would work on both Windows (where those includes are necessary) and Linux (where a simple -llapack works)?

[rexi]

Yes, by using scopes. See the qmake manual.

Basically, add this to your .pro file:

win32 {
    INCLUDEPATH += "C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\include
    LIBS += -L"C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\lib\x64" -llapack
}

win32 {
    INCLUDEPATH += "C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\include
    LIBS += -L"C:\Program Files (x86)\University Of Tennessee\LAPACK 3.1.1\lib\x64" -llapack
}

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[Skywalker]

Thanks a lot for the help