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Thanks for your help. Adding -lpthread moved the goal post and -lrt got it to build clean. The full line is below for when the Fedora guys upgrade to 13 and start running into this. -I/usr/include/qt4 -I/usr/lib/qt4/include -L/usr/lib/qt4 -L/usr/lib/qt4/lib -lc -lstdc++ -lQtGui -lQtCore -lpthread -lrt

I get the following and the money line would appear to be /usr/bin/ld: /tmp/ccOBy7h6.o: undefined reference to symbol 'sem_timedwait@@GLIBC_2.2.5' /usr/bin/ld: note: 'sem_timedwait@@GLIBC_2.2.5' is defined in DSO /lib64/libpthread.so.0 so try adding it to the linker command line How do I add /lib64/...