Hi, I'm looking at developing a cross-platform application in C++ using the QT library && Netbeans on Ubuntu (9.10) and I'd like to be able to use Boost libs for threading so I've installed libboost1.40-all-dev. My version of gcc is :: 4.4.1 I've read there is a problem between this version of gcc and boost and that there is a patch somewhere. I'm a bit of a linux newbie so if anyone knows about this and can point me at the patch, it'd be great. I have followed a very straight forward example of how to use boost::thread from here --> http://www.drdobbs.com/cpp/184401518;jsessionid=OUWYLHI3ITUAHQE1GHOSKHWATMY3... Looking at the compiler output my inexperienced eyes are telling me the linker can't find the boost lib(s) it wants ? Any help or advice anyone can give will be greatly appreciated. Regards, Chris My code is as follows :: #include <QtGui/QApplication> #include <qt4/QtGui/qwidget.h> #include "qtMain.h" #include "DummySourceMgr.h" #include "DummySource.h" #include <boost/thread.hpp> void startDSM() { DummySourceMgr * dsm = new DummySourceMgr(); dsm->start(); } int main(int argc, char *argv[]) { // initialize resources, if needed // Q_INIT_RESOURCE(resfile); QApplication app(argc, argv); // create and show your widgets here qtMain * main = new qtMain(); main->show(); boost::thread systest1(&startDSM); systest1.join(); return app.exec(); } When I build in netbeans I get the following compiler output ::-> /usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .clean-conf make[1]: Entering directory `/home/dansonc/NetBeansProjects/StreamLaser' qmake VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro mv -f qttmp-Debug.mk nbproject/qt-Debug.mk /usr/bin/make -f nbproject/qt-Debug.mk distclean make[2]: Entering directory `/home/dansonc/NetBeansProjects/StreamLaser' rm -f moc_qtMain.cpp rm -f ui_qtMain.h rm -f build/Debug/GNU-Linux-x86/DummySource.o build/Debug/GNU-Linux-x86/qtMain.o build/Debug/GNU-Linux-x86/DummySourceMgr.o build/Debug/GNU-Linux-x86/main.o build/Debug/GNU-Linux-x86/moc_qtMain.o rm -f *~ core *.core rm -f dist/Debug/GNU-Linux-x86/StreamLaser rm -f qttmp-Debug.mk make[2]: Leaving directory `/home/dansonc/NetBeansProjects/StreamLaser' make[1]: Leaving directory `/home/dansonc/NetBeansProjects/StreamLaser' CLEAN SUCCESSFUL (total time: 428ms) /usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf make[1]: Entering directory `/home/dansonc/NetBeansProjects/StreamLaser' qmake VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro mv -f qttmp-Debug.mk nbproject/qt-Debug.mk /usr/bin/make -f nbproject/qt-Debug.mk dist/Debug/GNU-Linux-x86/StreamLaser make[2]: Entering directory `/home/dansonc/NetBeansProjects/StreamLaser' /usr/bin/uic-qt4 qtMain.ui -o ui_qtMain.h g++-4.4 -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. -o build/Debug/GNU-Linux-x86/DummySource.o DummySource.cpp DummySource.cpp:27: warning: unused parameter 'orig' DummySource.cpp: In member function 'void DummySource::start()': DummySource.cpp:36: warning: unused variable 'n' g++-4.4 -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. -o build/Debug/GNU-Linux-x86/qtMain.o qtMain.cpp g++-4.4 -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. -o build/Debug/GNU-Linux-x86/DummySourceMgr.o DummySourceMgr.cpp DummySourceMgr.cpp:15: warning: unused parameter 'orig' g++-4.4 -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. -o build/Debug/GNU-Linux-x86/main.o main.cpp /usr/bin/moc-qt4 -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. qtMain.h -o moc_qtMain.cpp g++-4.4 -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -Inbproject -I. -o build/Debug/GNU-Linux-x86/moc_qtMain.o moc_qtMain.cpp g++ -o dist/Debug/GNU-Linux-x86/StreamLaser build/Debug/GNU-Linux-x86/DummySource.o build/Debug/GNU-Linux-x86/qtMain.o build/Debug/GNU-Linux-x86/DummySourceMgr.o build/Debug/GNU-Linux-x86/main.o build/Debug/GNU-Linux-x86/moc_qtMain.o -L/usr/lib -lQtGui -lQtCore -lpthread build/Debug/GNU-Linux-x86/main.o: In function `main': /home/dansonc/NetBeansProjects/StreamLaser/main.cpp:44: undefined reference to `boost::thread::join()' /home/dansonc/NetBeansProjects/StreamLaser/main.cpp:47: undefined reference to `boost::thread::~thread()' /home/dansonc/NetBeansProjects/StreamLaser/main.cpp:47: undefined reference to `boost::thread::~thread()' build/Debug/GNU-Linux-x86/main.o: In function `mutex': /usr/include/boost/thread/pthread/mutex.hpp:40: undefined reference to `boost::thread_resource_error::thread_resource_error()' /usr/include/boost/thread/pthread/mutex.hpp:40: undefined reference to `boost::thread_resource_error::~thread_resource_error()' /usr/include/boost/thread/pthread/mutex.hpp:40: undefined reference to `typeinfo for boost::thread_resource_error' build/Debug/GNU-Linux-x86/main.o: In function `condition_variable': /usr/include/boost/thread/pthread/condition_variable_fwd.hpp:33: undefined reference to `boost::thread_resource_error::thread_resource_error()' /usr/include/boost/thread/pthread/condition_variable_fwd.hpp:33: undefined reference to `boost::thread_resource_error::~thread_resource_error()' /usr/include/boost/thread/pthread/condition_variable_fwd.hpp:33: undefined reference to `typeinfo for boost::thread_resource_error' build/Debug/GNU-Linux-x86/main.o: In function `thread_data_base': /usr/include/boost/thread/pthread/thread_data.hpp:54: undefined reference to `vtable for boost::detail::thread_data_base' build/Debug/GNU-Linux-x86/main.o: In function `thread<void (*)()>': /usr/include/boost/thread/detail/thread.hpp:188: undefined reference to `boost::thread::start_thread()' build/Debug/GNU-Linux-x86/main.o: In function `~thread_data': /usr/include/boost/thread/detail/thread.hpp:40: undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /usr/include/boost/thread/detail/thread.hpp:40: undefined reference to `boost::detail::thread_data_base::~thread_data_base()' build/Debug/GNU-Linux-x86/main.o:(.rodata._ZTIN5boost6detail11thread_dataIPFvvEEE[typeinfo for boost::detail::thread_data<void (*)()>]+0x8): undefined reference to `typeinfo for boost::detail::thread_data_base' collect2: ld returned 1 exit status make[2]: *** [dist/Debug/GNU-Linux-x86/StreamLaser] Error 1 make[2]: Leaving directory `/home/dansonc/NetBeansProjects/StreamLaser' make[1]: *** [.build-conf] Error 2 make[1]: Leaving directory `/home/dansonc/NetBeansProjects/StreamLaser' make: *** [.build-impl] Error 2 BUILD FAILED (exit value 2, total time: 14s)