Log message:
Update to 5.2.1. From the changelog:

* Fix #22 (pip package keeps upgrading all the time)
* Support PyPy
* Remove the HTTP Status 9001 test that caused unit test tracebacks
* Remove the completely-untested HTML tidy code
* Remove BeautifulSoup as a dependency
* Remove the XFN microformat parsing code
* Remove the rel_enclosure microformat parsing code
* Remove the rel_hcard microformat parsing code
* Remove the rel_tag microformat parsing code
* Replace the regex-based RFC 822 date parser with a procedural one
* Replace the Python-licensed W3DTF date parser
* Support HTML5 audio/source/video element relative URL's
* Remove the unparsed itunes_keywords key from the result dictionary
* Fix issue 321 just a little more (yet another code path was missed)
* Issue 62 (support georss and gml namespaces)
* Issue 296 (GUID's are always treated like relative URI's)
* Issue 334 (media:restriction element content is not returned)
* Issue 335 (sub-elements of media:group are not parsed and returned)
* Issue 342 (support multiple dc:creator elements)
* Issue 357 (loose parser breaks ampersands in link element URL's)
* Issue 374 (support the Podlove Simple Chapters namespace)
* Issue 380 (support media:rating element)
* Issue 384 (fix chardet support in Python 3)
* Issue 389 (elements in unknown uppercase namespaces are ignored)
* Issue 392 (tags element subverts 'tags' key in result dictionary)
* Issue 396 (Podlove Simple Chapters version 1.0 causes a KeyError)
* Issue 399 (docs call `request_headers` parameter `extra_headers`)
* Issue 401 (support additional dcterms and media namespaces elements)
* Issue 404 (support asctime datetime strings with timezone information)
* Issue 407 (decode forward slashes encoded as character entities)
* Issue 421 (delay chardet invocation as long as possible)
* Issue 422 (add return types docstrings)
* Issue 433 (update the list of allowed MathML elements and attributes)

Log message:
Mark packages as not ready for python-3.x where applicable;
either because they themselves are not ready or because a
dependency isn't. This is annotated by
PYTHON_VERSIONS_INCOMPATIBLE=  33 # not yet ported as of x.y.z
or
PYTHON_VERSIONS_INCOMPATIBLE=  33 # py-foo, py-bar
respectively, please use the same style for other packages,
and check during updates.

Use versioned_dependencies.mk where applicable.
Use REPLACE_PYTHON instead of handcoded alternatives, where applicable.
Reorder Makefile sections into standard order, where applicable.

Remove PYTHON_VERSIONS_INCLUDE_3X lines since that will be default
with the next commit.

Whitespace cleanups and other nits corrected, where necessary.

Log message:
The revived rss2email (not yet in pkgsrc) requires Python 3.2 or
higher, and depends on this, so this must work with Python 3.2 or
higher.

Log message:
Update to 5.1.3. From the changelog:

* Consolidated and simplified the character encoding detection code
* Issue 346 (the gb2312 encoding isn't always upgraded to gb18030)
* Issue 350 (HTTP Last-Modified example is incorrect in documentation)
* Issue 352 (importing lxml.etree changes what exceptions libxml2 throws)
* Issue 356 (add support for the HTML5 attributes `poster` and `preload`)
* Issue 364 (enclosure-sniffing microformat code can throw ValueError)
* Issue 373 (support RFC822-ish dates with swapped days and months)
* Issue 376 (uppercase 'X' in hex character references cause ValueError)
* Issue 382 (don't strip inline user:password credentials from FTP URL's)

Log message:
Drop superfluous PKG_DESTDIR_SUPPORT, "user-destdir" is default these days.

Log message:
Update to 5.1.2. From the changelog:

* Minor changes to the documentation
* Strip potentially dangerous ENTITY declarations in encoded feeds
* feedparser will now try to continue parsing despite compression errors
* Fix issue 321 a little more (the initial fix missed a code path)
* Issue 337 (`_parse_date_rfc822()` returns None on single-digit days)
* Issue 343 (add magnet links to the ACCEPTABLE_URI_SCHEMES)
* Issue 344 (handle deflated data with no headers nor checksums)
* Issue 347 (support `itunes:image` elements with a `url` attribute)
* Fix mistakes, typos, and bugs in the unit test code
* Fix crash in Python 2.4 and 2.5 if the feed has a UTF_32 byte order mark
* Replace the RFC822 date parser for more extensibility
* Issue 304 (handle RFC822 dates with timezones like GMT+00:00)
* Issue 309 (itunes:keywords should be split by commas, not whitespace)
* Issue 310 (pubDate should map to `published`, not `updated`)
* Issue 313 (include the compression test files in MANIFEST.in)
* Issue 314 (far-flung RFC822 dates don't throw OverflowError on x64)
* Issue 315 (HTTP server for unit tests runs on 0.0.0.0)
* Issue 321 (malformed URIs can cause ValueError to be thrown)
* Issue 322 (HTTP redirect to HTTP 304 causes SAXParseException)
* Issue 323 (installing chardet causes 11 unit test failures)
* Issue 325 (map `description_detail` to `summary_detail`)
* Issue 326 (Unicode filename causes UnicodeEncodeError if locale is ASCII)
* Issue 327 (handle RFC822 dates with extraneous commas)
* Issue 328 (temporarily map `updated` to `published` due to issue 310)
* Issue 329 (escape backslashes in Windows path in docs/introduction.rst)
* Issue 331 (don't escape backslashes that are in raw strings in the docs)

Log message:
No compiler is requilred.

Log message:
Simplify. Don't allow Python 3 due to unsupported setuptools dependency.