我cvCalcOpticalFlowLK在我的代码中使用函数（OpenCV 2.4.1 和 Ubuntu 12.04）。我缺少头文件并收到此错误：
opticalflowLK.c: In function ‘int main(int, char**)’:
opticalflowLK.c:33:67: error: ‘cvCalcOpticalFlowLK’ was not declared in this scope
谁能告诉我的头文件cvCalcOpticalFlowLK？
谢谢。