error: missing template arguments

[WhiteMoZJ]

This is the following compliation error when I run examples/SimpleScene/main.cpp code(not this built example) in Qt with cmake: it comes from pangolin include file /pangolin/scene/scenehandler.h

/usr/local/include/pangolin/scene/scenehandler.h:71: error: missing template arguments before ‘(’ token
71 |                 hit_map.emplace(std::pair(buf[1],
   |                                          ^