[systemd-devel] [PATCH] Allow configuring without systemd-only dependencies

[Bryan Kadzban]

Some dependencies (intltool, m4, dbus, pkg-config, PAM) are only
required or useful for systemd, not for udev.  Leave these required by
default, but allow them to be made optional if the right flag is used to
./configure.

Signed-Off-By: Bryan Kadzban <bryan at kadzban.is-a-geek.net>

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This is necessary for anyone who wants to build udev only.  It's not
sufficient, but without this or something like it, ./configure fails
hard.  This change touches *only* configure; if the dependencies are
made optional in a ./configure run, and they don't exist on the system
(or in some cases, even if they do) make will fail hard.

I'm not attached to the --with-X flag's name; coming up with a better
one would be fine.

Unfortunately there's no "use intltool if it's present, otherwise don't
bother" variant of IT_PROG_INTLTOOL.  If that's wanted, I could hack it
together with another invocation of AC_PATH_PROG, but this is slightly
simpler.
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