When trying to use the external quartz on my Blue Pill STM32F103C8T6 by running:
rtc.setClockSource(STM32RTC::RTC_LSE_CLOCK);
the compiler returns
LEDMatrixClock:46:32: error: 'RTC_LSE_CLOCK' is not a member of 'STM32RTC' rtc.setClockSource(STM32RTC::RTC_LSE_CLOCK); ^~~~~~~~~~~~~