[Bro] How can I use the USE_PERFTOOLS_DEBUG ?

[John Donnelly]

I see :

#ifdef USE_PERFTOOLS_DEBUG
        fprintf(stderr, "    -m|--mem-leaks                 | show leaks
 [perftools]\n");
        fprintf(stderr, "    -M|--mem-profile               | record heap
[perftools]\n");
#endif

in main.cc - How can I use these?
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