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Trouble installing to MSYS2 on Windows 10

I'm having problems with OpenCV with MSYS2 on Windows 10 x64 and Python 3.7. I can get OpenCV to install, but when I run a simple test script, it throws an exception.

$ python3 C:\\msys64\\home\\gpraceman\\gtk_test.py
C:/msys64/mingw64/lib/python3.7\importlib\_bootstrap.py:219: Warning: Numpy built with MINGW-W64 on Windows 64 bits is experimental, and only available for
testing. You are advised not to use it for production.

CRASHES ARE TO BE EXPECTED - PLEASE REPORT THEM TO NUMPY DEVELOPERS
  return f(*args, **kwds)
Traceback (most recent call last):
  File "C:\msys64\home\gpraceman\gtk_test.py", line 1, in <module>
    import cv2
  File "C:/msys64/mingw64/lib\cv2\__init__.py", line 89, in <module>
    bootstrap()
  File "C:/msys64/mingw64/lib\cv2\__init__.py", line 79, in bootstrap
    import cv2
ImportError: DLL load failed: The specified module could not be found.

Below is how I installed OpenCV, which installs version 4.0.1. I also tried with PIP, but it wouldn't install at all (Could not find a version that satisfies the requirement opencv-python).

pacman -S mingw-w64-x86_64-opencv

I found the cv2 folder and OpenCV DLLs under C:\msys64\mingw64\lib. I did add that location to my Windows path.

I also tried setting up Anaconda and was able to get OpenCV to work, however, I could not get Gtk3+ to install and that is a requirement for my project. Gtk3+ works on MSYS2. I even tried copying the cv2 and opencv_python folders from site-packages on Anaconda over to MSYS2 but no joy. If I copied over the Gtk3+ files to Anaconda no joy again. So, I cannot get either environment to fully work for my project.

Trouble installing to MSYS2 on Windows 10

I'm having problems with OpenCV with MSYS2 on Windows 10 x64 and Python 3.7. I can get OpenCV to install, but when I run a simple test script, it throws an exception.

$ python3 C:\\msys64\\home\\gpraceman\\gtk_test.py
C:/msys64/mingw64/lib/python3.7\importlib\_bootstrap.py:219: Warning: Numpy built with MINGW-W64 on Windows 64 bits is experimental, and only available for
testing. You are advised not to use it for production.

CRASHES ARE TO BE EXPECTED - PLEASE REPORT THEM TO NUMPY DEVELOPERS
  return f(*args, **kwds)
Traceback (most recent call last):
  File "C:\msys64\home\gpraceman\gtk_test.py", line 1, in <module>
    import cv2
  File "C:/msys64/mingw64/lib\cv2\__init__.py", line 89, in <module>
    bootstrap()
  File "C:/msys64/mingw64/lib\cv2\__init__.py", line 79, in bootstrap
    import cv2
ImportError: DLL load failed: The specified module could not be found.

Below is how I installed OpenCV, which installs version 4.0.1. I also tried with PIP, but it wouldn't install at all (Could not find a version that satisfies the requirement opencv-python).

pacman -S mingw-w64-x86_64-opencv

I found the cv2 folder and OpenCV DLLs under C:\msys64\mingw64\lib. I did add that location to my Windows path.

EDIT: I've also tried setting up a Python 3.7 x86 environment and get the same error. Here's the output with debug turned on:

>>> import cv2
OpenCV loader: os.name="nt"  platform.system()="Windows"
OpenCV loader: loading config: C:/msys64/mingw32/lib/cv2/config.py
OpenCV loader: loading config: C:/msys64/mingw32/lib/cv2/config-3.7.py
OpenCV loader: PYTHON_EXTENSIONS_PATHS=['C:/msys64/mingw32/lib/cv2/python-3.7']
OpenCV loader: BINARIES_PATHS=['C:/msys64/mingw32/lib/cv2/../../bin']
OpenCV loader: PATH=C:/msys64/mingw32/lib/cv2/../../bin;C:\msys64\mingw32\bin;C:\msys64\usr\local\bin;C:\msys64\usr\bin;C:\msys64\usr\bin;C:\Windows\System32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\msys64\usr\bin\site_perl;C:\msys64\usr\bin\vendor_perl;C:\msys64\usr\bin\core_perl;C:\msys64\mingw32\bin\
OpenCV loader: replacing cv2 module

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:/msys64/mingw32/lib\cv2\__init__.py", line 90, in <module>
    bootstrap()
  File "C:/msys64/mingw32/lib\cv2\__init__.py", line 80, in bootstrap
    import cv2
ImportError: DLL load failed: The specified module could not be found.