[MacPorts] #54376: math/gsl documentation variant now depends on Sphinx

[MacPorts]

#54376: math/gsl documentation variant now depends on Sphinx
----------------------+------------------------
  Reporter:  slewsys  |      Owner:  dtakahashi
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  gsl      |
----------------------+------------------------

Comment (by Schamschula):

 Replying to [comment:5 slewsys]:
 > Replying to [comment:2 Schamschula]:
 > > There are a number of problems here:
 > >
 > > 1) you can't have two depends_build lines, you need to continue using
 {{{\}}}
 >
 > Updated.
 >
 > > 2) py-sphinx_rtd_theme can be called from several versions of python
 that could be installed
 >
 > It appears this is done via:
 >
 >              `depends_build
 port:py${python.default_version}-sphinx_rtd_theme`
 >
 > Could someone confirm this?

 I don't think using the python PortGroup works. I have a similar issue
 with the nghttp2 port. I tried a different approach in this case:

 I added
 {{{
                     bin:sphinx-build:py27-sphinx \
 path:Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/sphinx_rtd_theme:py27-sphinx_rtd_theme \
 path:Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/typing.py:py27-typing \
 path:Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/sphinxcontrib/websupport:py27-sphinxcontrib-websupport
 }}}

 to {{{depends_build}}}. This checks for any version of the required python
 ports, but installs the python 2.7 version as a fall-back.

 >
 > > 3) py-sphinx_rtd_theme has dependencies
 > >
 > > 4) I'm still seeing issues with the latex documentation: there is no
 MacPorts fncychap package at the moment
 >
 > `fncychap` is provided by `port:texlive-latex-extra`,  and has been
 added to gsl Portfile `depends_build`.
 >
 > > 5) The revision on py-sphinx-rtd-theme needs to be reset to 0 (or the
 revision line needs to be deleted - preferred). The gsl revision needs to
 be set to 1.
 >
 > Thank you to Schamschula for flagging these problems!  An updated
 math_gsl_Portfile.diff is attached.
 > -AM

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Ticket URL: <https://trac.macports.org/ticket/54376#comment:6>
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