That is: the .name file and the D-Bus policy.
It's needed for useful use of charon-nm, unlike the GUI.

The auth dialog is built separately from the actual plugin -- we need
to guess where the auth dialog will end up. If the distros override it,
they set it to the same path NetworkManager uses.

It's the preferred location for system-provided plugins.

A compatible file in /etc is still kept. Also, the compatibility /etc
file needs to use a full path due to a bug in GNOME Shell.

The full path to a arch-dependent file in a supposedly arch-independent
file is a sin and a multilib violation in some distributions. Hovewer.
some pre-release versions of NetworkManager-1.2 as shipped by
distributions require a full path. Let's keep a configure-time option
for that.

PKG_CHECK_MODULES does the substitutions.

The former is deprecated and the newer API is nicer anyway.

 strongswan#1013