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1f9b792168
MRI's BigInt use GMP under the hood if available, and if not
fallbacks to an homemade implementation with much worse performance.
Without GMP:
```
>> Benchmark.realtime { Integer('1' * (10 ** 7)) }
=> 13.80743500002427
```
With GMP
```
>> Benchmark.realtime { Integer('1' * (10 ** 7)) }
=> 0.4098639999865554
```
macOS not being a common production platform, it's not a huge deal
but it would still preferable to compile with `gmp.h` if present.
I'd also suggest to print a warning if compiling on macOS and gmp
isn't installed, but I don't know if it's desirable.
NB: `--with-gmp-dir` was only added recently, so this will only
apply to MRI >= 3.2, as well as rubies on which this flag was backported.
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