树莓派提示pyqtgraph requires Qt version ＞= 5.12 (your version is

大前提：
如下安装好pyqt和pyqtgraph

$ sudo apt-get install python3-pyqt5
$ pip3 install pyqtgraph
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple, https://www.piwheels.org/simple

Collecting pyqtgraph
  Downloading https://www.piwheels.org/simple/pyqtgraph/pyqtgraph-0.12.1-py3-none-any.whl (939 kB)
     |████████████████████████████████| 939 kB 155 kB/s 
Requirement already satisfied: numpy>=1.17.0 in /home/pi/.local/lib/python3.7/site-packages (from pyqtgraph) (1.19.5)
Installing collected packages: pyqtgraph
Successfully installed pyqtgraph-0.12.1

测试版本程序

from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QT_VERSION_STR
from PyQt5.Qt import PYQT_VERSION_STR
from sip import SIP_VERSION_STR
import pyqtgraph as pg
if __name__=='__main__':
    import sys
    print("Qt5 Version Number is: {0}".format(QT_VERSION_STR))
    print("PyQt5 Version is: {}".format(PYQT_VERSION_STR))
    print("Sip Version is: {}".format(SIP_VERSION_STR))

输出结果

[5, 11]
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    import pyqtgraph as pg
  File "/home/pi/.local/lib/python3.7/site-packages/pyqtgraph/__init__.py", line 13, in <module>
    from .Qt import QtGui, mkQApp
  File "/home/pi/.local/lib/python3.7/site-packages/pyqtgraph/Qt.py", line 391, in <module>
    raise Exception('pyqtgraph requires Qt version >= %d.%d  (your version is %s)' % (versionReq[0], versionReq[1], QtVersion))
Exception: pyqtgraph requires Qt version >= 5.12  (your version is 5.11.3)

尝试过手动编译安装最新版本的PyQT5.15.4，依旧报这个错误。
注释掉这一行
结果：

即使说换了PyQT5的版本Qt5的版本还是5.11.3
也尝试过换Qt5.12.1的版本，还是打印这个

终极解决方案

$ pip3 install pyqtgraph==0.11.1