cmake HAVE_STD_UNORDERED_MAP_HEADER examples

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :433 

CHECK_INCLUDE_FILE_CXX(unordered_map HAVE_STD_UNORDERED_MAP_HEADER)

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :468 

ELSE (HAVE_STD_UNORDERED_MAP_HEADER)

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :478 

ENDIF (HAVE_STD_UNORDERED_MAP_HEADER)