The default is to use the system one if found. If the
WXWIN environment variable is set and points to a valid
wxWidgets tree, that will be used. Otherwise, it will
search the platform specific locations.
You can use a local library instead with:
cmake -Duse_system_wxwigets=no ...
In this case it will look for the WXWIN environment variable
and use that or it will download the Audacity specific wxWidgets
source. In both cases, wxWidgets will be built as part of the
Audacity project.
It's still has some work, but it successfully builds on
all 3 main platforms. Some of the outstanding items
include:
Install target testing (mostly important for Linux)
CMakeList clean up and comments
Debug and Release build verification
Audit of compile/link options
Need a Mac signed and notarized build
(and probably more)