Cannot build microbench

[achanda]

Expected behavior

I followed the instructions at https://github.com/facebook/rocksdb/tree/7d9642d8761725cbc02a6bd6e8011a2865ec4d00/microbench and tried to build microbench using Makefile

Actual behavior

Got a build error

╰─$ make run_microbench                                                                                                                                                                                  
$DEBUG_LEVEL is 1, $LIB_MODE is shared
Makefile:185: Warning: Compiling in debug mode. Don't use the resulting binary in production
  CC       microbench/ribbon_bench.o
microbench/ribbon_bench.cc:8:10: fatal error: 'benchmark/benchmark.h' file not found
#include "benchmark/benchmark.h"
         ^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [microbench/ribbon_bench.o] Error 1

Steps to reproduce the behavior

Run the following from rocksdb root

make run_microbench                                                                                                                                                                                  

[achanda]

This worked after manually building and installing benchmark. Is it possible to detect if benchmark is available in the Makefile?