mangos/mangos — comment on commit 0a0540e6fc645c9dfa64130509cbac26d0a7fbe1
File:  line 0
By Schmoozerd:

:( this I really don't understand...

CLM.h includes Common.h, which includes "Utilities/UnorderedMapSet.h" where UNORDERED_MAP is defined

Hmm, maybe the problem is that ObjectGuid is not defined.
Can you check with #include "ObjectGuid.h" in CLM.h ?