I am new to QWT. So I read about everything in the net. But I still cannot force examples work. I've done export LD_LIBRARY_PATH="/usr/local/qwt-5.2.0/lib", but there is still error while loading shared libraries: libqwt.so.5: cannot open shared object file: No such file or directory. Goodness, I don't know what I have to do. I've done ldconfig. Nothing. I don't know what should I write in /etc/ld.so.conf. Help me please!