GTKMM3 related error while installing Cadabra on Windows

Question

I'm trying to install Cadabra on Windows. Following the instructions, I inevitably get stuck near the very end, after cloning the repository and whilst using cmake. The error I am met with is:

CMake Error at cmake/windows.cmake:194 (message):
Could NOT find library gdkmm required for GTKMM3_LIBRARIES
Call Stack (most recent call first):
cmake/modules/FindGTKMM3.cmake:3 (windows_find_library)
C:/Users/user/code/vcpkg/scripts/buildsystems/vcpkg.cmake:772 (_find_package)
frontend/CMakeLists.txt:24 (find_package)

Previously, I've had the exact same error pop up for two other libraries, atkmm and gdk, but solved these two by typing the following into the terminal:

vcpkg install atkmm:x64-windows
install gtk3:x64-windows

respectively. (The first one might be redundant, I am not sure.) This caveman-mentality approach to solving the issue came directly from the directions themselves, as one of the previous steps utilizes vcpkg install gtkmm:x64-windows, which should (I guess?) install everything necessary, but it doesn't seem to do so.

My question, then, is how can I download/install/build gdkmm on my Windows OS?

I have tried using similar commands like:

vcpkg install gdkmm:x64-windows

but what I'm met with is another error, stating that this does not exist. My guess is that all of the above were somehow and somewhere located in my vcpkg folder locally, whereas the one from above is missing.