Document what the magic variable .MAKE.EXPAND_VARIABLES actually does.
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.\" $NetBSD: make.1,v 1.267 2017/06/19 19:58:24 christos Exp $
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.\" $NetBSD: make.1,v 1.268 2017/06/22 13:21:21 dholland Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" from: @(#)make.1 8.4 (Berkeley) 3/19/94
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.\"
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.Dd June 19, 2017
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.Dd June 22, 2017
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.Dt MAKE 1
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.Os
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.Sh NAME
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@ -207,7 +207,9 @@ Print debugging information about target list maintenance.
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.It Ar V
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Force the
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.Fl V
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option to print raw values of variables.
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option to print raw values of variables, overriding the default behavior
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set via
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.Va .MAKE.EXPAND_VARIABLES.
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.It Ar v
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Print debugging information about variable assignment.
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.It Ar x
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@ -781,6 +783,10 @@ from which generated dependencies are read.
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A boolean that controls the default behavior of the
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.Fl V
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option.
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If true, variable values printed with
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.Fl V
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are fully expanded; if false, the raw variable contents (which may
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include additional unexpanded variable references) are shown.
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.It Va .MAKE.EXPORTED
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The list of variables exported by
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.Nm .
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