[Bug 201349] math/py-networkx: Cannot build with py3k because of select dependencies

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201349

            Bug ID: 201349
           Summary: math/py-networkx: Cannot build with py3k because of
                    select dependencies
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: john at saltant.com
                CC: dikshie at sfc.wide.ad.jp, python at FreeBSD.org
                CC: dikshie at sfc.wide.ad.jp
             Flags: maintainer-feedback?(dikshie at sfc.wide.ad.jp)

Created attachment 158355
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158355&action=edit
math/py-networkx: Make most run-time dependencies optional

Several ports currently identified as run-time dependencies for
math/py-networkx cannot yet be built under py3k. Specifically,
graphics/py-graphviz, math/py-matplotlib, and science/py-scikit-sparse.
Consequently, math/py-networkx cannot be built under py3k either, even though
it is otherwise py3k-compatible.

The attached patch works around this problem by making most run-time
dependencies optional, which is consistent with the upstream project
documentation
(https://networkx.github.io/documentation/networkx-1.9.1/install.html#requirements).
A user who wishes to build the port against py3k can elect to disable the
problematic optional dependencies.

Note: I am aware of the stock option descriptions defined in
Mk/bsd.options.desc.mk, but choose not to implicitly use them in order to more
precisely describe the effect of the option on the depending port.

While here, update WWW in pkg-descr.

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