I&#39;m trying to sort out how to compile a sub-project in two different ways (the conditional code is controlled by -DJAVA).  I&#39;ll make two different libaries (foo &amp; foo_java).  The question is how to let the boost-build know that there are distinct sets of objects even though the sources are identical.<br>
<br>lib foo : s1.c s2.c ;<br><br>lib foo_java : s1.c s2.c : &lt;define&gt;JAVA ;<br><br>The above is what I&#39;m inclined to utter, but I get complaints about  Duplicate name of actual target: &lt;pbin/sun/debug/link-static&gt;s1.o<br>
<br>Other projects would say:<br><br>exe bar : bar.c ..//foo<br><br>exe baz: baz.c ..//foo_java<br><br>Of course, I&#39;d like to refactor the code so that it isn&#39;t littered with conditions, but I hope that isn&#39;t a prerequisite to migrating from make to bjam.<br>