[Rprotobuf-yada] Autoconf help

[Murray Stokely]

RProtoBuf on FreeBSD doesn't find the protobuf headers even from the
standard system location /usr/local/include without setting an environment
variable or command-line flag.

I'm completely ignorant of autoconf.  Does anyone know how best to add
something to configure.in to tell it to check /usr/local/include in
addition to wherever it is currently checking that seems to work on
Debian/Ubuntu?

            - Murray
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