In 94ad652, code was added to check for 64-bit time. The following code was added in order to check for the existence of a type:

#ifdef __time64_t

The problem with this, as far as I'm aware, is that you cannot use ifdef to check whether a type has been defined. See further discussion here¹. Was there a particular reason this code was added? It breaks builds on 32-bit systems with 64-bit time enabled.