Modifying frysk.junit.Runner.unsupported(String,boolean) to return false (i.e., force running of unsupported) tests leads firstly to a series of cascading errors: Running test64To32Isa(frysk.proc.TestIsa) ...ERROR (UNSUPPORTED) 32-on-64 java.lang.NullPointerException Running test64To32To64(frysk.proc.TestIsa) ...ERROR (UNSUPPORTED) 32-on-64 java.lang.NullPointerException Running testArbitraryISAInstantiation(frysk.proc.TestIsa) ...PASS Running testMapGet(frysk.proc.TestMapGet) ...FAIL junit.framework.AssertionFailedError Running testMemoryReadWrite(frysk.proc.TestMemory) ...FAIL (UNRESOLVED) http://sourceware.org/bugzilla/show_bug.cgi?id=3725 junit.framework.AssertionFailedError Running testRequestRemoveAckDaemon(frysk.proc.TestProcForceDetach) ...FAIL junit.framework.AssertionFailedError and eventually to an abort: Running testRepeatedHostRefresh(frysk.proc.TestRefresh) ...FAIL junit.framework.AssertionFailedError Running testHostRefresh(frysk.proc.TestRefresh) ...Aborted (core dumped)