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From:	"Nick Bowler (nbowler AT draconx DOT ca) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Fri, 26 Feb 2021 10:25:17 -0500
Message-ID:	<CADyTPEzNEG=sg9A35B6OJfTYXuPUjMUJ1huaTNsEsoLJHiMQrA@mail.gmail.com>
Subject:	Re: [geda-user] FreeBSD 12.2 "make all-recursive" error
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On 2021-02-26, Roland Lutz <rlutz AT hedmen DOT org> wrote:
> On Fri, 26 Feb 2021, Don Kuenz (mail AT crcomp DOT net) [via
> geda-user AT delorie DOT com] wrote:
>> You are correct, $< apparently doesn't work with FreeBSD 'make.' FreeBSD
>> now builds gschem error-free when gschem/src/Makefile.am contains the
>> lines shown below. Does the one, remaining $< near the top also need a
>> substitution?
>
> That's a good question.  The build process uses $< in a number of places;
> I wonder why it's a problem here and not everywhere else.  Maybe $< only
> works in suffix rules with FreeBSD `make'?

This is very likely to be the case.

POSIX defines $< only for suffix (inference) rules and .DEFAULT.  In
many make implementations this is the only place they work.  ($* is
also only required to work in suffix rules).

> If so, the $< in the `.c.x' rule should be fine.

Indeed, the use in the .c.x rule looks to be portable.

Cheers,
  Nick

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