Undefined symbols for architecture x86_64:
  "tbb::internal::itt_region_end_v9(tbb::internal::itt_domain_enum, void*, unsigned long long)", referenced from:
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in BufferCache.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in CacheManager.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in ConstantsCache.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in DeviceContextCache.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in EffectCache.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in EffectInstanceCache.o
      tbb::internal::itt_region_end(tbb::internal::itt_domain_enum, void*, unsigned long long) in FormatCache.o
      ...
  "tbb::internal::itt_region_begin_v9(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index)", referenced from:
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in BufferCache.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in CacheManager.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in ConstantsCache.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in DeviceContextCache.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in EffectCache.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in EffectInstanceCache.o
      tbb::internal::itt_region_begin(tbb::internal::itt_domain_enum, void*, unsigned long long, void*, unsigned long long, tbb::internal::string_index) in FormatCache.o
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)