Hi all!

The attached patch defines and uses the make-Variable PREFIX for all
OSes (and not only FreeBSD).
The default value is the one used by virtually everyone - including
auto-tools: "/usr/local".

This implies that packagers (and others) must pass the parameter
PERFIX=/usr to "make" if they want to install under "/usr".

* add PREFIX to the top-level Makefile.inc
* use it instead of /usr
* kill local PREFIX and LIBDIR instances

I propose to add it right after the next - soon to be IIUC - release.

	Bernd

PS: This is a conventional patch (more or less) as I didn't had time to
    learn how to push such stuff into some public - preferrably histed
    by me - hg repo.
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