diff -r f62b42f0b751 -r eb97a082741b rt/mojo/src/main/java/org/apidesign/bck2brwsr/mojo/AheadOfTime.java
--- a/rt/mojo/src/main/java/org/apidesign/bck2brwsr/mojo/AheadOfTime.java	Mon Jun 09 12:40:40 2014 +0200
+++ b/rt/mojo/src/main/java/org/apidesign/bck2brwsr/mojo/AheadOfTime.java	Wed Jun 25 22:50:33 2014 +0200
@@ -101,6 +101,9 @@
             if ("provided".equals(a.getScope())) {
                 continue;
             }
+            if ("system".equals(a.getScope())) {
+                continue;
+            }
             File aot = new File(prj.getBuild().getDirectory(), classPathPrefix);
             aot.mkdirs();
             File js = new File(aot, n.substring(0, n.length() - 4) + ".js");