pytime.h compilation gives warnings - 

pytime.h:123:59: warning: 'struct timeval' declared inside parameter list will not be visible outside of this definition or declaration
 PyAPI_FUNC(int) _PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv);
                                                           ^~~~~~~
pytime.h:130:12: warning: 'struct timeval' declared inside parameter list will not be visible outside of this definition or declaration
     struct timeval *tv,
            ^~~~~~~
pytime.h:135:12: warning: 'struct timeval' declared inside parameter list will not be visible outside of this definition or declaration
     struct timeval *tv,

=====

I think the reason for this is that the struct timeval isn't declared anywhere before the declaration of this function. For me on windows, the structure is defined inside of winsock.h and including it before the other python header files fixes the problem.

timval is defined in sys/time.h.

This would be something to do with your setup, but you did not provide any information about your system and the steps you took to get to this point so it's hard to know what happened.

In any case, 3.7 is no longer maintained so I am closing this. Please create a new issue, with more information, if you are seeing this problem on a current version (>= 3.9).