Build failure on macOS: rsthreads.cc: error: invalid operands of types '<unresolved overloaded function type>' and 'int' to binary 'operator!='

[barracuda156]

/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_net_libretroshare/libretroshare/work/libretroshare-5e3d142b087151b3a6d05896a0244ba6352e9e44/src/util/rsthreads.cc: In member function 'bool RsThread::start(const std::string&)':
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_net_libretroshare/libretroshare/work/libretroshare-5e3d142b087151b3a6d05896a0244ba6352e9e44/src/util/rsthreads.cc:215:60: error: invalid operands of types '<unresolved overloaded function type>' and 'int' to binary 'operator!='
  215 |                 if(pthread_setname_np && !threadName.empty())
      |                                                            ^
make[2]: *** [CMakeFiles/retroshare.dir/src/util/rsthreads.cc.o] Error 1
make[2]: *** Waiting for unfinished jobs....

[barracuda156]

The code there is old, so it certainly compiled earlier. Perhaps gcc14 became stricter with something relevant?