Zephyr syscalls aren't getting generated

[chroco]

I'm trying to get fprime-zephyr-led-blinker working on a stm32 nucleo_f091rc. I experimented on both the main and fprime-v3.5.0 branch and got stuck on the same build error. This error is for atomic_c.h but none of the syscalls get generated.

fprime-zephyr-led-blinker/zephyrproject/zephyr/include/zephyr/sys/atomic_c.h:88:10: fatal error: zephyr/syscalls/atomic_c.h: No such file or directory  
   88 | #include <zephyr/syscalls/atomic_c.h>

However, it looks to me like syscalls are supposed to be getting generated.

build-fprime-automatic-zephyr/zephyr/include/generated/zephyr/autoconf.h:  
#define CONFIG_ATOMIC_OPERATIONS_C 1  

Does anyone have any ideas?