Question: I'm trying to install pyqt5 V5.15.2 on an emulate qemu aarch64 debian distro, but it fails with the following trace: root@debian-arm64:~# pip install pyqt5==5.15.2 --config-settings --confirm-license= --verbose Using pip 23.0.1 from /usr/local/lib/python3.9/dist-packages/pip (python 3.9) Collecting pyqt5==5.15.2 Using cached PyQt5-5.15.2.tar.gz (3.3 MB) Running command pip subprocess to install build dependencies Collecting sip<7,>=5.3 Using cached sip-6.7.7-cp37-abi3-linux_aarch64.whl Collecting PyQt-builder<2,>=1.6 Using cached PyQt_builder-1.14.1-py3-none-any.whl (3.7 MB) Collecting toml Using cached toml-0.10.2-py2.py3-none-any.whl (16 kB) Collecting packaging Using cached packaging-23.0-py3-none-any.whl (42 kB) Collecting ply Using cached ply-3.11-py2.py3-none-any.whl (49 kB) Collecting setuptools Using cached setuptools-67.5.1-py3-none-any.whl (1.1 MB) Installing collected packages: ply, toml, setuptools, packaging, sip, PyQt-builder Successfully installed PyQt-builder-1.14.1 packaging-23.0 ply-3.11 setuptools-67.5.1 sip-6.7.7 toml-0.10.2 WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv Installing build dependencies ... done Running command Getting requirements to build wheel Getting requirements to build wheel ... done Running command Preparing metadata (pyproject.toml) Querying qmake about your Qt installation... This is the GPL version of PyQt 5.15.2 (licensed under the GNU General Public License) for Python 3.9.2 on linux. Found the license file 'pyqt-gpl.sip'. Checking to see if the QtCore bindings can be built... Checking to see if the QtNetwork bindings can be built... Checking to see if the QtGui bindings can be built... Checking to see if the QtWidgets bindings can be built... Checking to see if the QtQml bindings can be built... Checking to see if the QAxContainer bindings can be built... Checking to see if the QtAndroidExtras bindings can be built... Checking to see if the QtBluetooth bindings can be built... Checking to see if the QtDBus bindings can be built... Checking to see if the QtDesigner bindings can be built... Checking to see if the Enginio bindings can be built... Checking to see if the QtHelp bindings can be built... Checking to see if the QtMacExtras bindings can be built... Checking to see if the QtMultimedia bindings can be built... Checking to see if the QtMultimediaWidgets bindings can be built... Checking to see if the QtNetworkAuth bindings can be built... Checking to see if the QtNfc bindings can be built... Checking to see if the QtOpenGL bindings can be built... Checking to see if the QtPositioning bindings can be built... Checking to see if the QtLocation bindings can be built... Checking to see if the QtPrintSupport bindings can be built... Checking to see if the QtQuick bindings can be built... Checking to see if the QtQuick3D bindings can be built... Checking to see if the QtQuickWidgets bindings can be built... Checking to see if the QtRemoteObjects bindings can be built... Checking to see if the QtSensors bindings can be built... Checking to see if the QtSerialPort bindings can be built... Checking to see if the QtSql bindings can be built... Checking to see if the QtSvg bindings can be built... Checking to see if the QtTest bindings can be built... Checking to see if the QtTextToSpeech bindings can be built... Checking to see if the QtWebChannel bindings can be built... Checking to see if the QtWebKit bindings can be built... Checking to see if the QtWebKitWidgets bindings can be built... Checking to see if the QtWebSockets bindings can be built... Checking to see if the QtWinExtras bindings can be built... Checking to see if the QtX11Extras bindings can be built... Checking to see if the QtXml bindings can be built... Checking to see if the QtXmlPatterns bindings can be built... Checking to see if the _QOpenGLFunctions_2_0 bindings can be built... Checking to see if the _QOpenGLFunctions_2_1 bindings can be built... Checking to see if the _QOpenGLFunctions_4_1_Core bindings can be built... Checking to see if the dbus-python support should be built... The dbus-python package does not seem to be installed. These bindings will be built: Qt, QtCore, QtNetwork, QtGui, QtWidgets, QtDBus, QtOpenGL, QtPrintSupport, QtSql, QtTest, QtXml, _QOpenGLFunctions_2_0, _QOpenGLFunctions_2_1, _QOpenGLFunctions_4_1_Core, pylupdate, pyrcc. Generating the Qt bindings... _in_process.py: /tmp/pip-install-m6oiyjbv/pyqt5_1965ddd1193045bab17bb1f59ff08aa1/sip/QtCore/qprocess.sip: line 99: column 5: 'Q_PID' is undefined error: subprocess-exited-with-error × Preparing metadata (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> See above for output. note: This error originates from a subprocess, and is likely not a problem with pip. full command: /usr/bin/python3 /usr/local/lib/python3.9/dist-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpo3qo2dlh cwd: /tmp/pip-install-m6oiyjbv/pyqt5_1965ddd1193045bab17bb1f59ff08aa1 Preparing metadata (pyproject.toml) ... error error: metadata-generation-failed × Encountered error while generating package metadata. ╰─> See above for output. note: This is an issue with the package mentioned above, not pip. hint: See above for details.  The only 2 stuff I'm getting warn about are:  Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv The dbus-python package does not seem to be installed.  Speaking about the first one, every package installation is printing it: I don't care, that's just an emulated test environment. Speaking about the second one, I've installed libdbus-1-3 and libdbus-1-dev and ran both pip install dbus-python (which seems to be a deprecated module) and dbus-next, so i don't know what still missing there. ISSUE Apparently a Q_PID var in qprocess.sip seems to be undefined  _in_process.py: /tmp/pip-install-m6oiyjbv/pyqt5_1965ddd1193045bab17bb1f59ff08aa1/sip/QtCore/qprocess.sip: line 99: column 5: 'Q_PID' is undefined  QUESTION What am I doing wrong? How should I fix this error? EXTRA INFOS List of installed packages: root@debian-arm64:~# pip list Package Version ------------------------- -------------- altgraph 0.17.3 certifi 2020.6.20 chardet 4.0.0 dbus-next 0.2.3 dbus-python 1.3.2 httplib2 0.18.1 idna 2.10 Mako 1.1.3 Markdown 3.3.4 MarkupSafe 1.1.1 packaging 23.0 pip 23.0.1 ply 3.11 pycurl 7.43.0.6 Pygments 2.7.1 pyinstaller 5.8.0 pyinstaller-hooks-contrib 2023.0 PySimpleSOAP 1.16.2 python-apt 2.2.1 python-debian 0.1.39 python-debianbts 3.1.0 PyYAML 5.3.1 reportbug 7.10.3+deb11u1 requests 2.25.1 setuptools 67.5.1 six 1.16.0 toml 0.10.2 urllib3 1.26.5 wheel 0.34.2  Python environment: root@debian-arm64:~# python3 --version Python 3.9.2 root@debian-arm64:~# pip --version pip 23.0.1 from /usr/local/lib/python3.9/dist-packages/pip (python 3.9)  OS specs (debian-11.6.0-arm64): root@debian-arm64:~# uname -a Linux debian-arm64 5.10.0-21-arm64 #1 SMP Debian 5.10.162-1 (2023-01-21) aarch64 GNU/Linux  Are you guys able to help there? Thanks in advance, Hele.

Answer: I founded the following solution that worked for me: Instead of using pip for installing PyQt5, a PyQt5 package exists. Installing the package from apt worked for me.  sudo apt-get install python3-PyQt5