• Common GL library configuration is in common/raspberrypi.conf
• Model specific CFLAGS are set in linux-rpi2-g++, linux-rpi3-g++ and linux-rpi-g++
• Configuration helpers for armv6, armv7 and armv8 configurations

Select suitable configuration with -platform parameter to Qt configure.

For detailed instructions on how to build Qt 5.15 for a Raspberry Pi see

• https://www.tal.org/tutorials/building-qt-515-raspberry-pi