当我在 ubuntu 12.04 中编译 physx 的 demo 时，总是出现一些错误，就像
./../../SampleFramework/platform/lib/linux64/libSamplePlatform-MTCHECKED.a(LinuxSamplePlatform.cpp.o): In function `SampleFramework::LinuxPlatform::closeWindow()':
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:369: undefined reference to `XF86VidModeSwitchToMode'
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:370: undefined reference to `XF86VidModeSetViewPort'
./../../SampleFramework/platform/lib/linux64/libSamplePlatform-MTCHECKED.a(LinuxSamplePlatform.cpp.o): In function `SampleFramework::LinuxPlatform::openWindow(unsigned int&, unsigned int&, char const*, bool)':
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:271: undefined reference to `XF86VidModeQueryVersion'
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:299: undefined reference to `XF86VidModeGetAllModeLines'
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:310: undefined reference to `XF86VidModeSwitchToMode'
/home/squall/physx/Samples/compiler/linux64public/./../../SampleFramework/platform/src/linux/LinuxSamplePlatform.cpp:311: undefined reference to `XF86VidModeSetViewPort'
我添加了标头包含编译器提到的函数，但错误仍然出现。我已经筋疲力尽了 有谁能够帮助我？