Compilation OtxServer - Error

I have a problem with compiling sources from otxserver:

  CXX      position.o
player.cpp: In member function ‘virtual void Player::postAddNotification(Creature*, Thing*, const Cylinder*, int32_t, CylinderLink_t)’:
player.cpp:3471:7: warning: variable ‘requireListUpdate’ set but not used [-Wunused-but-set-variable]
  bool requireListUpdate = true;
       ^
player.cpp: In member function ‘virtual void Player::postRemoveNotification(Creature*, Thing*, const Cylinder*, int32_t, bool, CylinderLink_t)’:
player.cpp:3516:7: warning: variable ‘requireListUpdate’ set but not used [-Wunused-but-set-variable]
  bool requireListUpdate = true;
       ^
  CXX      protocol.o
  CXX      protocolgame.o
make[1]: *** No rule to make target `quest.o', needed by `theotxserver'.  Stop.
make[1]: *** Waiting for unfinished jobs....
  CXX      protocollogin.o

Does anyone know what could be the reason?

It is sources 8.1x

https://github.com/mattyx14/otxserver/archive/otxserv2.zip

Can anyone help?