[MERGE] [0.90] document optional pyrex dependency in INSTALL

[Paul Moore]

On 13/08/07, Alexander Belchenko <bialix at ukr.net> wrote:
> > I wasn't sure what URL to put for python-dev, so I didn't include one.
>
> For Windows version of Python there is not such thing as python-dev,
> all required files already inside standard distribution.
> Be more accurate here, please.

Specifically, you need the necessary headers to build extensions -
these are part of the standard Python distribution, but (many? some?)
Linux distributions split the standard distribution up - in those
cases, you need whatever the distribution deems to be the
"development" part of the Python distribution.

Ultimately, it's a vendor-specific issue. I'd suggest that the wording
be something like

"""
bzr can optionally use compiled versions of some parts of the code for
increased speed. When installing bzr you need the ability to build C
extensions. Some Linux distributions package the necessary headers
separately from the main Python package - if yours is one of these,
look for a (probably optional) package called something like
python-dev. FreeBSD and Windows users have all the necessary headers
installed by default.
"""

Paul.