3.6.2 refers to undefined symbol in .so file

[Eddie Welker]

Just trying to import etree fails with the new 3.6.2 release pushed to PyPI this morning.

```
from lxml import etree
E ImportError: /export/home/tomcat/TeamCity/Agent1/work/83f8e92ce6d42a47/.tox/py34/lib/python3.4/site-packages/lxml/etree.cpython-34m.so: undefined symbol: clock_gettime
```

```
(venv) [2087] welkere@host:~ $ ls -l /usr/lib/libx{m,s}*
lrwxrwxrwx 1 root root 16 Jun 24 10:09 /usr/lib/libxml2.so.2 -> libxml2.so.2.7.6*
-rwxr-xr-x 1 root root 1352268 Jun 23 04:51 /usr/lib/libxml2.so.2.7.6*
lrwxrwxrwx. 1 root root 17 Sep 24 2014 /usr/lib/libxslt.so.1 -> libxslt.so.1.1.26*
-rwxr-xr-x. 1 root root 242784 Sep 13 2012 /usr/lib/libxslt.so.1.1.26*
```

[scoder (scoder)]

What Linux distribution and version is this?

[Eddie Welker (eddie-welker)]

CentOS6, however I found that it works on CentOS7.

[BJV (ertcorp) (bjv-ert)]

encountering same issue, when upgrading from 3.6.1 to lxml-3.6.2-cp34-cp34m-manylinux1_x86_64.whl

distro: CentOS 6.8 (glibc 2.12)

[scoder (scoder)]

Thanks. The man page of "clock_gettime()" (which is used by libxslt) says that it requires linking with "-lrt" before glibc 2.17. Seems to work also with newer versions, though, so I'll add that to the list of shared libraries and rebuild. I'll remove the wheels for now.

[scoder (scoder)]

New wheels uploaded for lxml 3.6.3. Let's see if those work better.

[Eddie Welker (eddie-welker)]

Well, at least from the interpreter, 3.6.3 seemed to have fixed it. I'll add that to the application too.

[Eddie Welker (eddie-welker)]

Yep, worked like a charm. Thank you so much scoder!!!

[scoder (scoder)]

You're welcome. Thanks for the quick report.