hope some serious support from official onion .
There have already been a lot of threads here explaining how to build C programs, both via building a LEDE cross toolchain as part of a "close enough" LEDE build, or by a ready-to-go docker virtual machine image that has been offered. For someone in a position to really do native development, these work fine, and are the standard approach for an Embedded Linux system of this category.
It might be important to recognize that C development isn't really a primary goal of the product, compared to scripting languages and web widgets. Rather than chasing every varied user request (and especially those such as this that are already well covered by the community), the onion team's time would be far better spent catching up on their overdue obligations for corresponding source releases - the thing that only they can do.
In comparison to something that some might call a success, like the Raspberry Pi, the key takeway has to be that the system vendor there is only providing the Hardware and the directly required GPL sources - most of the resources people think of in the pi ecosystem, including Raspbian itself, do not come from the hardware vendor. It's a rich ecosystem precisely because they have enabled their community, and not restricted it to the glacial pace of doing everything themselves.
thanks for interesting
but .. realy !!
the steps not clear !