Created attachment 46362 [details] linking error log Build fails when FAST_FAST_MALLOC_MATCH_VALIDATION=1 in Platform.h. I filed the related build log. Internal::fastMallocMatchFailed(p); called at wtf/FastMalloc.h:164 declaration: wtf/FastMalloc.h:144, implementation: wtf/FastMalloc.cpp:165 The build works on linux, but on MAC. I think it can be something MAC specific... Can anyone check it?