install eigen in ubuntu and use it in qt

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1. download eigen from the link : http://eigen.tuxfamily.org/index.php?title=Main_Page


2.extract and copy to a location you want


sudo cp -avr /home/tjiang/Downloads/eigen-eigen-b30b87236a1b /usr/local/include/

3.  add the following line in .pro file

INCLUDEPATH += "/usr/local/include/eigen-eigen-b30b87236a1b"

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