how to set qwt path or environment variable

I have installed qwt and include the path

INCLUDEPATH += /usr/local/qwt-6.0.0-rc5/include

LIBS += -L/usr/local/qwt-6.0.0-rc5/lib -lqwt

in my profile.

But when I run my program i get the error

error while loading shared libraries: libqwt.so.6: cannot open shared object file: No such file or directory /home/cv/abc/abc exited with code 127

When using terminal I set the path

export LD_LIBRARY_PATH=/usr/local/qwt-6.0.0-rc5

Then when I run the program (using the play button of the interface) I am still getting an error. I don't know where I'm wrong, I'm totally stuck. Can someone explain me in detail how to make qwt work with qt? Does version make any difference? Please explain me in detail I shall b开发者_C百科e very thank full!

I am using ubuntu 10.04.

Thanks

1. You can install qwt in ubuntu way

   aptitude install libqwt-dev

2. Also in qtreator you can specify Run Enviroment for your project. Select Projects in left panel and goto Run Setting.

Did you add the path to Qwt to the run-time linker?

In /etc/ld.so.conf.d/ create a file qwt.conf where you just write the path to [your-qwt-path]/lib.

EDIT: You will, of course, need root privileges to create a file there. Also, I forgot to mention you will need to sudo ldconfig after creating that file. Lastly, it didn't work until I rebooted my system. :)