>maintaining m-tx, a program designed for Free Pascal only, I would like
>to Build-Depend on FPC to let m-tx be compiled natively (instead of
>being compiled via p2c / gcc). Unfortunately, FPC currently doesn't link
>binaries against libc which means syscalls (of Linux) are used directly.

That is correct.

>This causes interoperability issues when using multiple Linux versions
>(2.4/2.6) in a single Debian distribution.

I'm not aware of any issues. Could you give examples ? All syscalls used 
by FPC have been standard since 2.0 afaik.

>I read that FPC_USE_LIBC should be used for this, but I couldn't figure
>out how to use it since it's not really documented.

That's experimental, and not recommended or supported.

Problems with libcs constantly breaking binary interface is what drove us to
syscalls in the first place.



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