From the Sourceforge Disucssion forums: https://sourceforge.net/p/llcon/discussion/software/thread/487c151a57/?limit=25#6508

Tom Wagner:

_Make of the new release is failing on my Debian 9 Linode. It succeeds as usual on a Debian 8 server, instance, and on another Debian 9 client machine.

Working from git clone, my re-compile as follows is failing.

qmake "CONFIG+=NOSOUND" Jamulus.pro
make clean
make

throws this error:

--begin example--
src/serverlist.cpp: In member function ‘void CServerListManager::CentralServerRegisterServer(const CHostAddress&, const CHostAddress&, const CServerCoreInfo&, QString)’:
src/serverlist.cpp:315:18: error: ‘QVersionNumber’ has not been declared
QVersionNumber::compare ( QVersionNumber::fromString ( strMinServerVersion ), QVersionNumber::fromString ( strVersion ) ) > 0 )
^~~~~~~~~~~~~~
src/serverlist.cpp:315:44: error: ‘QVersionNumber’ has not been declared
QVersionNumber::compare ( QVersionNumber::fromString ( strMinServerVersion ), QVersionNumber::fromString ( strVersion ) ) > 0 )
^~~~~~~~~~~~~~
src/serverlist.cpp:315:96: error: ‘QVersionNumber’ has not been declared
mber::compare ( QVersionNumber::fromString ( strMinServerVersion ), QVersionNumber::fromString ( strVersion ) ) > 0 )
^~~~~~~~~~~~~~
Makefile:2251: recipe for target 'serverlist.o' failed
make: *** [serverlist.o] Error 1
--end example-----------

I re-installed the dependencies with apt and re-tried: no joy._