[PATCH] define AS_COPY_VAR in varnish.m4 if not already defined

[Federico Schwindt]

Looks good to me and others are doing the same, e.g.
https://github.com/gdnsd/gdnsd/issues/85.

On Mon, Dec 15, 2014 at 4:11 PM, Geoff Simmons <geoff at uplex.de> wrote:
>
> Hallo all,
>
> This patch makes it possible for autoconf < 2.63b (which is the
> unfortunate situation on distros such as RHEL 6.5) to interpret the m4
> macros needed for VMOD builds.
>
> AS_COPY_VAR is left alone if already defined, so the patch should have
> no effect on systems with a recent autoconf.
>
>
> Best,
> Geoff
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