[WIP] Debug R doc build failure
#20648
The packages built by anaconda include compiler flags (`-fPIC`) that should make this error impossible. Seeing if (temporarily) excluding conda-forge packages fixes things. Hello @TomAugspurger! Thanks for updating the PR.

 - In the file [`doc/source/conf.py`](https://github.com/pandas-dev/pandas/blob/d6e946607f102ea069612a91269fc72b8a80de20/doc/source/conf.py), following are the PEP8 issues :

> [Line 75:13](https://github.com/pandas-dev/pandas/blob/d6e946607f102ea069612a91269fc72b8a80de20/doc/source/conf.py#L75): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent





##### Comment last updated on April 26, 2018 at 14:14 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20830?src=pr&el=h1) Report
> Merging [#20830](https://codecov.io/gh/pandas-dev/pandas/pull/20830?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/630ef1649cb57a4068474baaff8c4a2b8a14b313?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/20830/graphs/tree.svg?token=eZ4WkYLtcO&width=650&src=pr&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/20830?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #20830   +/-   ##
=======================================
  Coverage   91.77%   91.77%           
=======================================
  Files         153      153           
  Lines       49281    49281           
=======================================
  Hits        45230    45230           
  Misses       4051     4051
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.17% <ø> (ø)` | :arrow_up: |
| #single | `41.88% <ø> (ø)` | :arrow_up: |


------

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> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20830?src=pr&el=footer). Last update [630ef16...d6e9466](https://codecov.io/gh/pandas-dev/pandas/pull/20830?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Hmm, still trying to get  a local reproducer, but https://travis-ci.org/pandas-dev/pandas/jobs/371582150#L2705 managed to import rpy2, I guess since it was imported early enough :/

https://stackoverflow.com/questions/19268293/matlab-error-cannot-open-with-static-tls/19468365#19468365

It sounds like either Travis' glibc is the bottleneck here. We won't be able to do much to work around it unfortunately. Thanks for looking into this. 
Temporary / definite workaround would be just remove that doc section, or to convert it to static code-blocks. Yeah. I'm able to build things locally, so I'm not too worried about it delaying the relase. closing as stale. if you'd like to continue pls ping.