I am building a QT app using QTwidgets to run in a RaspberyPi3 with an image inside the SDcard built with buildroot. I suppose that charts are supported since they are based
So, I solved this problem with the answer from Peter Korsgaard. Bassicly I removed my old bluetooth version, installed the new version which supports QtCharts ( https://buildroot.org/downloads/buildroot-2018.02-rc1.tar.gz ), and now my application is running. Problems found: Had the change the content of my cmdline.txt and config.txt because they were making the new version crash in boot and give "Kernel Panic". I just used the default cmdline.txt and config.txt generated by make, and now its running.