I have duplicated the same error on 2 different machines with stable stages, while on current it compiles fine.
The error appears to me as

""intern/memutil/MEM_Allocator.h:40:10: error: ‘ptrdiff_t’ does not name a type""
build.log here http://bpaste.net/show/66441/
While using google for the cause of this error, I see many packages can be affected with same error.