/tmp/cc3n6NaF.o: In function `Map::getDisplayedBlockArea()':
/home/chris/Desktop/minetestold/src/map.cpp:759: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.cpp:761: undefined reference to `JMutex::Unlock()'
/tmp/cc3n6NaF.o: In function `MapBlock::updateFastFaces()':
/home/chris/Desktop/minetestold/src/map.cpp:230: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.cpp:232: undefined reference to `JMutex::Unlock()'
/tmp/cc3n6NaF.o: In function `Map::getBlock(irr::core::vector3d<short>)':
/home/chris/Desktop/minetestold/src/map.cpp:299: undefined reference to `JMutex::Lock()'
/tmp/cc3n6NaF.o: In function `MapBlock':
/home/chris/Desktop/minetestold/src/map.h:193: undefined reference to `JMutex::JMutex()'
/home/chris/Desktop/minetestold/src/map.h:197: undefined reference to `JMutex::Init()'
/tmp/cc3n6NaF.o: In function `Map::getBlock(irr::core::vector3d<short>)':
/home/chris/Desktop/minetestold/src/map.cpp:360: undefined reference to `JMutex::Unlock()'
/tmp/cc3n6NaF.o: In function `MapBlock':
/home/chris/Desktop/minetestold/src/map.h:193: undefined reference to `JMutex::~JMutex()'
/tmp/cc3n6NaF.o: In function `Map::render(irr::video::IVideoDriver*, irr::video::SMaterial*)':
/home/chris/Desktop/minetestold/src/map.cpp:833: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.cpp:843: undefined reference to `JMutex::Unlock()'
/home/chris/Desktop/minetestold/src/map.cpp:866: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.cpp:889: undefined reference to `JMutex::Unlock()'
/tmp/cc3n6NaF.o: In function `MapUpdateThread::Thread()':
/home/chris/Desktop/minetestold/src/map.cpp:902: undefined reference to `JThread::ThreadStarted()'
/tmp/cc3n6NaF.o: In function `MapUpdateThread::getRun()':
/home/chris/Desktop/minetestold/src/map.h:529: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.h:531: undefined reference to `JMutex::Unlock()'
/tmp/cc3n6NaF.o:(.rodata._ZTI15MapUpdateThread[typeinfo for MapUpdateThread]+0x8): undefined reference to `typeinfo for JThread'
/tmp/ccwNy13Z.o: In function `~MapUpdateThread':
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/tmp/ccwNy13Z.o: In function `MapUpdateThread::setRun(bool)':
/home/chris/Desktop/minetestold/src/map.h:536: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.h:538: undefined reference to `JMutex::Unlock()'
/tmp/ccwNy13Z.o: In function `~Map':
/home/chris/Desktop/minetestold/src/map.h:583: undefined reference to `JThread::IsRunning()'
/tmp/ccwNy13Z.o: In function `~MapUpdateThread':
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/tmp/ccwNy13Z.o: In function `~Map':
/home/chris/Desktop/minetestold/src/map.h:581: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:581: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:581: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:581: undefined reference to `JMutex::~JMutex()'
/tmp/ccwNy13Z.o: In function `~MapUpdateThread':
/home/chris/Desktop/minetestold/src/map.h:512: undefined reference to `JThread::~JThread()'
/tmp/ccwNy13Z.o: In function `Map':
/home/chris/Desktop/minetestold/src/map.h:572: undefined reference to `JMutex::JMutex()'
/home/chris/Desktop/minetestold/src/map.h:572: undefined reference to `JMutex::JMutex()'
/tmp/ccwNy13Z.o: In function `MapUpdateThread':
/home/chris/Desktop/minetestold/src/map.h:520: undefined reference to `JThread::JThread()'
/home/chris/Desktop/minetestold/src/map.h:520: undefined reference to `JMutex::JMutex()'
/home/chris/Desktop/minetestold/src/map.h:522: undefined reference to `JMutex::Init()'
/tmp/ccwNy13Z.o: In function `Map':
/home/chris/Desktop/minetestold/src/map.h:574: undefined reference to `JMutex::Init()'
/home/chris/Desktop/minetestold/src/map.h:575: undefined reference to `JMutex::Init()'
/home/chris/Desktop/minetestold/src/map.h:577: undefined reference to `JThread::Start()'
/tmp/ccwNy13Z.o: In function `Map::updateCamera(irr::core::vector3d<float>, irr::core::vector3d<float>)':
/home/chris/Desktop/minetestold/src/map.h:588: undefined reference to `JMutex::Lock()'
/home/chris/Desktop/minetestold/src/map.h:591: undefined reference to `JMutex::Unlock()'
/tmp/ccwNy13Z.o: In function `Map':
/home/chris/Desktop/minetestold/src/map.h:572: undefined reference to `JMutex::~JMutex()'
/home/chris/Desktop/minetestold/src/map.h:572: undefined reference to `JMutex::~JMutex()'
/tmp/ccwNy13Z.o: In function `MapUpdateThread':
/home/chris/Desktop/minetestold/src/map.h:520: undefined reference to `JThread::~JThread()'
/home/chris/Desktop/minetestold/src/map.h:520: undefined reference to `JMutex::~JMutex()'
collect2: ld returned 1 exit status
make: *** [all_linux] Error 1