When building frysk one object file at a time tis occures: ../../frysk/frysk-core/frysk/ftrace/TestLtrace.java: In class 'frysk.ftrace.TestLtrace$10$MyObserverCreator3': ../../frysk/frysk-core/frysk/ftrace/TestLtrace.java: In method 'frysk.ftrace.TestLtrace$10$MyObserverCreator3.createObserver()': ../../frysk/frysk-core/frysk/ftrace/TestLtrace.java:409: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. can be worked around by configuring/building frysk with --enable-jar-compile and using the rhel 5.2 compiler so I'm guessing this is an unlikely to fix.