This issue hides a bug in jdeps:

## Starting verify-modules
Checking dependencies across JDK modules
Exception in thread "main" java.lang.ClassCastException: com.sun.tools.jdeps.Archive cannot be cast to com.sun.tools.jdeps.Module
    at com.sun.tools.jdeps.Analyzer$ModuleAccessAnalyzer.run(Analyzer.java:351)
    at com.sun.tools.jdeps.JdepsTask.verifyModuleAccess(JdepsTask.java:404)
    at com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:351)
    at com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:329)
    at com.sun.tools.jdeps.Main.main(Main.java:48)
make[3]: *** [checkdeps] Error 1
make[2]: *** [verify-modules] Error 2
make[1]: *** [main-wrapper] Error 2
make: *** [clean] Error 2