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This helps workaround problem noted on bind10-users list last week
and this was discussed on jabber last week.

Note that if the m4 macro doesn't exist. Then even if pkg-config
is installed later, the configure script will still fail. autoconf
will need to be ran again.


git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@2106 e5f2f494-b856-4b98-b285-d166d9295462