This was odd. I’m noting here so 1) I don’t forget and 2) in case anyone else runs into this. My STM32CubeIDE 1.4.0 based project was building fine, I used the STM32CubeMX editor to unlink PC13 from the user button since it was limiting my RTC configuration. On saving and re-generating, a bunch of my FreeRTOS includes stopped being found by the compiler. Scrutinzing the diff of my .cproject file showed all of the paths had been removed from the configuration. I added them all back in and the project resumed building normally. It is possible this is because I’ve switched to Windows based development for this project, or it…