This is currently only supported on Linux and with the appropriate
permissions.
Since it's experimental, it's disabled by default.
The log messages for each sent and received ESP message are logged in NET
like the ones in the socket-default plugin for UDP-encapsulated messages.
INCLUDES are now deprecated and throw warnings when using automake 1.13.
We now also differentiate AM_CPPFLAGS and AM_CFLAGS, where includes and
defines are passed to AM_CPPFLAGS only.