Install and use QWT under Mac OS X

I am currently trying to get QWT 6.1.0 running under MAC OS X 10.7.5. I followed the instructions over here --> http://qwt.sourceforge.net/qwtinstall.html I didn't changed something inside the configuration files.

So everything worked fine, but now I want to use the qwt-libary inside my own Project. I added the following line to my .pro

INCLUDEPATH +=  /Users/userX/Downloads/qwt-6.1.0/src

So my Project is now able to find all the header Files. But I also have to link against the libary. But I dont know how to do so. I tried using something like this:

LIBS  += -L /usr/local/qwt-6.1.0/lib -lqwt

But than I get an error called "libary not found for -lqwt".

What I am doing wrong? How can I link against the library or how could I import the qwt framework into my project?

I found a solution. Here is a step by step guide on how to install QWT 6.1.0 under Mac OS X and get it running inside the QT-Creator :

Download the .tar.bz2 from here http://sourceforge.net/projects/qwt/files/qwt/6.1.0/
Extract it where you want, for Example inside your Download-Folder
Then change into the directory qwt-6.1.0
Then you have to locate the qmake command line tool ( you can do so by simply searchng for it inside the Finder.
Then qmake the qwt.pro File like /Applications/QT/5.1.0/clang_64/bin/qmake qwt.pro
make
sudo make install
Inside your QT Project you have to add the following line to the .pro File include ( /usr/local/qwt-6.1.0/features/qwt.prf ) includes QWT libary into Project
Now you have to create a softlink like this : sudo ln -s /usr/local/qwt-6.1.0/lib/qwt.framework/qwt /usr/lib/qwt

Thats it. QWT now should work.

UNDER MAVERICKS:

If you are using Mavericks you have to manually copy the qwt.framework to Libary/Frameworks folder for not getting the "dyld: Library not loaded: libqwt.6.dylib" error .. i dont know why but it works.