Install tag mail

I was trying to install a python package,yagmail and got these errors:

`
iPad:~# pip3 install yagmail
Collecting yagmail
Using cached yagmail-0.14.260-py2.py3-none-any.whl (16 kB)
Collecting premailer
Using cached premailer-3.10.0-py2.py3-none-any.whl (19 kB)
Requirement already satisfied: requests in /usr/lib/python3.8/site-packages (from premailer->yagmail) (2.25.1)
Collecting cachetools
Using cached cachetools-4.2.4-py3-none-any.whl (10 kB)
Collecting cssselect
Using cached cssselect-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting lxml
Using cached lxml-4.6.4.tar.gz (3.2 MB)
ERROR: Command errored out with exit status 1:
command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-ww2dy9n3/lxml/setup.py'"'"'; __file__='"'"'/tmp/pip-install-ww2dy9n3/lxml/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-cca9cc60
cwd: /tmp/pip-install-ww2dy9n3/lxml/
Complete output (3 lines):
Building lxml version 4.6.4.
Building without Cython.
Error: Please make sure the libxml2 and libxslt development packages are installed.
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
`

Start by reproducing `pip3 install yagmail` in iSH and review the reported `lxml` `setup.py egg_info` failure. No project file or test is named; done would mean identifying whether this is an iSH packaging issue and recording a confirmed fix or supported installation path for the missing libxml2 and libxslt development packages.

Written by the indexing model from the issue text.