pkg-config

[Niels Möller]

I just checked in nettle.pc.in and hogweed.pc.in. configure then
generates nettle.pc and hogweed.pc, for use wiith pkg-config.

I don't have any previous experience with pkg-config, so comments are
much appreciated.

Not yet any make rules to install them. I don't know if installation
should be unconditional, or if one should first check, somehow, if
pkg-config is installed. (And then hogweed.pc should be installed only if the
hogweed library is built and installed).

Apparantly, at least one user wants pkg-config support, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634294

Regards,
/Niels

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