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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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doc/guix.texi
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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} it takes care of wrapping these programs so that their @code{PYTHONPATH}
environment variable points to all the Python libraries they depend on. environment variable points to all the Python libraries they depend on.
Which Python package is used can be specified with the @code{#:python} Which Python package is used to perform the build can be specified with
parameter. 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 @end defvr
@defvr {Scheme Variable} perl-build-system @defvr {Scheme Variable} perl-build-system