qt4 rm -f main.o rm -f *~ core *.core compiling main.cpp linking qt4 db rm -f main.o rm -f *~ core *.core compiling main.cpp linking db xrandr rm -f main.o rm -f *~ core *.core compiling main.cpp linking xrandr /usr/bin/ld: main.o: undefined reference to symbol 'XOpenDisplay' /usr/bin/ld: note: 'XOpenDisplay' is defined in DSO /usr/lib/libX11.so.6 so try adding it to the linker command line /usr/lib/libX11.so.6: could not read symbols: Invalid operation collect2: error: ld returned 1 exit status make: *** [xrandr] Error 1 zeroconf rm -f zeroconf.o rm -f *~ core *.core compiling zeroconf.cpp zeroconf.cpp:1:20: fatal error: dns_sd.h: No such file or directory #include ^ compilation terminated. make: *** [zeroconf.o] Error 1 Reading /var/uhubuild/work/compile/src/core/core.pro Reading /var/uhubuild/work/compile/src/gui/gui.pro Reading /var/uhubuild/work/compile/src/designer/designer.pro Reading /var/uhubuild/work/compile/src/network/network.pro Reading /var/uhubuild/work/compile/src/sql/sql.pro Reading /var/uhubuild/work/compile/src/berkeley/berkeley.pro Reading /var/uhubuild/work/compile/src/web/web.pro