Hello,

Currently I am using Qt 5.5.1, Qwt 6.1.3 on ubuntu 16.04. I went through and installed qwt following the standard procedure (qmake, make, make install) and it installed fine. When I tried to install qwtpolar however i get an error during make that says:
qwt_polar_fitter.h:13:30: fatal error: qwt_curve_fitter.h: No such file or directory

I have tried doing qmake -set QMAKEFEATURES /user/local/qwt.6.1.3/features and then running the qwtpolar qmake and make again but the same error still pops up. I have no idea what else to do. Any help/guidance would be greatly appreciated.

also i would like to note that i have been able to run the qwt examples, but have yet to install the qwt designer plugin, its on my list of things to do. Don't know if this matters.