title: GNU Make with patsubst: need two substitutions
body: <p>I need to reference the stem twice in the replacement for a variable substitution:</p>
  
  <p><code>O23=$(OROOTS:%=$(ODIR)/overx-%2wk-%3wk.mlb)</code></p>
  
  <p>I need to perform two replacements with the same stem, but the substitution uses <code>patsubst</code> which only does the first.  How can we accomplish both?</p>