Index: doc/papers/concurrency/Makefile
===================================================================
--- doc/papers/concurrency/Makefile	(revision 161cdf1c71c97c71ad36951e9dbd349acb64b7d9)
+++ doc/papers/concurrency/Makefile	(revision 3ef35bd884d4a41b6dc4f4a4a2243f1e96843a20)
@@ -75,6 +75,6 @@
 	mkdir -p ${Build}
 
-${BASE}.out.ps:
-	ln -fs build/Paper.out.ps .
+${BASE}.out.ps: ${Build}
+	ln -fs ${Build}/Paper.out.ps .
 
 WileyNJD-AMA.bst: