#31 Opal Compile Error Ubuntu-Bionic

[Paul Timothy Crossley]

My apologies if I've missed something basic - I haven't been a software engineer for over 20 years!
Following the recipe on http://wiki.opalvoip.org/index.php?n=Main.BuildingOpalUnix
I Tried to compile Opal on Ubuntu-bionic using both GIT and Snapshot
Both gave the same compile time error :
/usr/local/src/opalvoip-opal/src/opal/manager.cxx: In member function 'void OpalManager::InternalClearAllCalls(OpalConnection::CallEndReason, bool, bool)':
/usr/local/src/opalvoip-opal/src/opal/manager.cxx:814:13: error: 'const class PSafeDictionary<pstring, opalcall="">::iterator_pair' has no member named 'Clear'</pstring,>