error: ‘function’ is not a member of ‘std’;

[jyzhong]

i meet the following problem:
/home/slam/Documents/MYNT-EYE-OKVIS-Sample/build/okvis/brisk/src/brisk_external/src/brisk-feature-detector.cc:61:8: error: ‘function’ is not a member of ‘std’;
std::function<bool(const cv::KeyPoint& key_pt)> masking =

hope recieve your solution about this issue.