Compilation Failure of RediSearch on Centos 7.9

Facing issue while compiling RediSearch on my Centos7.9 VM .

In file included from /root/RediSearch/src/geometry/geometry_api.cpp:8:
/root/RediSearch/src/geometry/rtree.hpp:22:10: fatal error: boost/unordered/unordered_flat_map.hpp: No such file or directory
22 | #include <boost/unordered/unordered_flat_map.hpp> // is faster than std::unordered_map?
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[3]: *** [src/geometry/CMakeFiles/redisearch-geometry.dir/build.make:76: src/geometry/CMakeFiles/redisearch-geometry.dir/geometry_api.cpp.o] Error 1
make[2]: *** [CMakeFiles/Makefile2:749: src/geometry/CMakeFiles/redisearch-geometry.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs…