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From: Ed Maste <emaste@freebsd.org>
Date: Thu, 22 Jan 2015 09:48:45 -0500
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Subject: Re: FW: elf linking problem
To: Konstantin Belousov <kostikbel@gmail.com>
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, "Sinha,
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On 22 January 2015 at 05:38, Konstantin Belousov <kostikbel@gmail.com> wrote:
>
> If module B depends on the symbol from a module A, the dependency
> must be declared with the MODULE_DEPEND() macro.  Look for examples
> in the tree to see how to use it.

There's also a MODULE_DEPEND(9) man page with some information,
although it is rather terse.