Gnu-isms in makefile templates.

[Mats Erik Andersson]

Hello again,

there are unfortunate Gnu-isms in "doc/Makefile.am", "lib/Makefile.am",
and "src/Makefile.am". The problem lies in the use of $^ and $<, which
are not universal. Resolving these references allows BSD make to build
the source as build-inside-source, at least on FreeBSD and NetBSD.

I have also added some first few findings that approach an out-of-dir
build setup using BSD make, catching som missing $(srcdir) references.
Most importantly, the use of "$(srcdir)/gdoc" which affects also a
GNU/Linux system.

There remain some further work on full out-of-tree building, but the
present modifications are readily assembled.

Best regards,

  Mats Erik Andersson

0002-Portability-issues-for-BSD-make.patch
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