Python not finding a library (so, dll) from a PyPi package

I am using PyQt5 library and trying to use pylupdate:

from PyQt5.pylupdate_main import main

This gives me the error:

ImportError: libQt5Xml.so.5: cannot open shared object file: No such file or directory

While the file is located in /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/

I could fix by doing:

LD_LIBRARY_PATH=/usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/:$LD_LIBRARY_PATH python -c "from PyQt5.pylupdate_main import main"

It used to work without adding the path before. How can this be done? Is this something to fix in the wheel?

---

This can be easily reproduced with Docker:

FROM python:3.7
RUN pip install PyQt5
RUN echo $(ls /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libQt5Xml.so.5)
RUN ldd /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libQt5Xml.so.5
RUN python -c "from PyQt5.pylupdate_main import main"

---

Output of ldd /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libQt5Xml.so.5 is these:

 ---> Running in 6c4c1fbe5de2
    linux-vdso.so.1 (0x00007ffecb7d5000)
    libQt5Core.so.5 => /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libQt5Core.so.5 (0x00007fbc76abe000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fbc76a94000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fbc76910000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbc7678d000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fbc76773000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbc765b2000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fbc76392000)
    libicui18n.so.56 => /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libicui18n.so.56 (0x00007fbc75ef9000)
    libicuuc.so.56 => /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libicuuc.so.56 (0x00007fbc75b41000)
    libicudata.so.56 => /usr/local/lib/python3.7/site-packages/PyQt5/Qt/lib/libicudata.so.56 (0x00007fbc7415e000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbc74159000)
    libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fbc74154000)
    libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fbc74033000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fbc774d1000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fbc73fbf000)

from Python not finding a library (so, dll) from a PyPi package