[PATCH] configure: fix mktemp call for macOS

[Daniel Kahn Gillmor]

On Fri 2019-06-14 20:57:07 +0300, Tomi Ollila wrote:

> Yes. $TMPDIR could be problematic if it makes the full (unix domain
> socket?) path be too long.

Modern, maintained version of GnuPG will only place sockets directly in
the $GNUPGHOME if /run/user/$(id -u) (i.e., $XDG_RUNTIME_DIR) is not
available.

I've just sent a message to gnupg-devel asking for help from upstream
there, this shouldn't be this complicated.  see
id:87blyxd2qu.fsf at fifthhorseman.net on gnupg-devel at gnupg.org ("safe
ephemeral GnuPG homdirs").

          --dkg
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