I installed OpenCV package using vcpkg, and since the OpenCV comes with vcpkg's own build configuration does not support libgtk, I got error when trying to run OpenCV with in WSL2 on windows 10.
The solution I found OpenCV GTK+2.x error suggests to add -DWITH_GTK=ON to the cmake configuration. And I added that option to the portfile in $vcpkgRoot/port/opencv4/porfile.make. And I try to rebuild/update the OpenCV, but seems it does not work.
I searched the documentation and could not find a clear description on how to use updated/customized portfile to rebuild the package. The only way that seems to work is to uninstall and install it again with the modified portfile.
If you used vcpkg install opencv and then used vcpkg remove opencv opencv4 will not be removed since the port opencv is just a redirection to opencv4. So if you want to remove opencv4 you need to use vcpkg remove opencv4 --recurse or vcpkg remove opencv opencv4. The same is true for e.g. openssl which needs to specific the platform e.g openssl-windows for correct removal.
And you cannot use the upgrade command since this requires a change of the version in the CONTROL file.