Comment 2 for bug 736273

The solution will be to change the mutex reference into a pointer (which will not need to be mutable). A bug entry has been opened against this issue, but it looks like a patch hasn't been installed at this time. This is of course an issue with the very latest gcc.

https://bugs.launchpad.net/epics-base/+bug/736273

In the future it will be preferable to use the improved epicsMutex class which allows reference counting of the mutex instance.