If you are getting an error when running make similar to
/home/pedro/online/scripts/unocommands.py --check /home/pedro/online
Traceback (most recent call last):
File "/home/pedro/online/scripts/unocommands.py", line 13, in <module>
from lxml import etree
ImportError: /usr/lib64/python3.6/site-packages/lxml/etree.cpython-36m-x86_64-linux-gnu.so: undefined symbol: PyFPE_jbuf
Please check if you do not have important Python updates. This was my case, where python3-lxml was not yet updated (openSUSE Leap 15.2).
After doing the appropriated updates on your package manager the build should work properly afterwards.