Comment #48 on issue 2482 by [email protected]: Stop bundling mpmath
http://code.google.com/p/sympy/issues/detail?id=2482

it does break with various earlier versions of mpmath

We can add workarounds, as for any other library.

So I think it should be quite easy to keep a copy of a working mpmath version with sympy, but have a switch (in setup.py?) to use external version if the user wants.

There is a lot of problems with bundled library, not just simplify sympy's maintenance in Linux distributions. Quote some from this discussion:
- DLL hell
- more complex py3 support

Arguments against unbundling:
- a more complex installation on Win/Mac
- more testing
- mpmath is not a quite stable
- mpmath is an integral part of sympy

First three, I think, have proven to be wrong. Regarding the last one, I would like to point on mpfr (an alternative?).

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