Errors compiling; (LD_)LIBRARY_PATH

[cLupus]

I was trying to install QCustomPlot, but ran into a problem; The last step of the build process was unable to link Qt5Core, Qt5Gui, Qt5Widget, and QL5PrintSupport. I figured it was due to do Qt being installed in /opt.

After some trail, and error, I was able to solve the problem by setting LD_LIBRARY_PATH and LIBRARY_PATH to point to my Qt's lib folder.

this might be an issue for others, and so you might want to add it to the README :smile_cat:

PS: Thanks for this wrapper!