OK, I understand.
If this is the only issue then we can work around it.

Is it possible to enable extra uclibc features? It seems that the missing aio.h could be provided by uclibc:

(from git://uclibc.org/uClibc.git)

..
..
config UCLIBC_HAS_REALTIME
bool "Realtime-related family of SUSv ...

Currently I do UAV telemetry with a board using the Nordic Semiconductor nRF9160. Works fine, but it will not run standard software stacks and lacks a camera interface.
Thus, i am considering designing a small PCB with a Core1106 and a regular Quectel/Simcom/Sierra/etc. LTE modem. Bought a Pico Mini ...