How to run qwt application in DevKit OK6410

I use Qt Creator2.0 to make my qwt application in ubuntu10.04. It runs very well. Now I want to transfer my app. to DevKit OK6410, that has Qt/E4.7 lib. I use arm-linux-gcc 4.3.2 to compile qwt and my app. , everything is ok and I get exec file. When I run that exec file in OK6410, I get the message:error while loading shared libraries: libqwt.so.6: cannot open shared object file: No such file or directory, but libqwt.so.6 is in qwt-6.0.0-rc5 folder in OK6410. What is the problem?
Thank you.