Johannes Schindelin <johannes.schindelin@xxxxxx> writes: > This quick fix, however, tests for *long* to be 64-bit or not. What we > need, though, is a test that says whether *whatever data type we use for > timestamps* is 64-bit or not. > > The same quick fix was used to handle the similar problem where Git's > source code uses `unsigned long` to represent size, instead of `size_t`. > > So let's just add another prerequisite to test specifically whether > timestamps are represented by a 64-bit data type or not. Later, when we > will have switched to using `time_t` where appropriate, we can flip that > prerequisite to test `time_t` instead of `long`. The changes that move from LONG_IS to TIME_IS in this patch are all about time (iow, LONG_IS_64BIT prereq is still used in the check on sizes). The patch looks sensible.