doc: Clarify how to use the '#:python' parameter.

* doc/guix.texi (Build Systems): Clearly distinguish between the package that
provides the Python interpreter for the build and the package that is to be
built.  Also, mention why one might want to use a specific Python version.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Chris Marusich 2016-03-30 02:43:16 -07:00 committed by Ludovic Courtès
parent 12af303f47
commit 8a46205b41
1 changed files with 5 additions and 2 deletions

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@ -2854,8 +2854,11 @@ For packages that install stand-alone Python programs under @code{bin/},
it takes care of wrapping these programs so that their @code{PYTHONPATH}
environment variable points to all the Python libraries they depend on.
Which Python package is used can be specified with the @code{#:python}
parameter.
Which Python package is used to perform the build can be specified with
the @code{#:python} parameter. This is a useful way to force a package
to be built for a specific version of the Python interpreter, which
might be necessary if the package is only compatible with a single
interpreter version.
@end defvr
@defvr {Scheme Variable} perl-build-system