Issue when building on Windows with MSVC
Since I wrote a blog post about building GTK4 applications on Windows, someone asked about gtkmm, so I gave it a try. https://www.collabora.com/news-and-blog/blog/2021/04/29/build-your-own-application-with-gtk4-as-a-meson-subproject/
There are a few simple fixes similar to those I mentioned here: https://github.com/libsigcplusplus/libsigcplusplus/issues/71.
But there is a more serious showstopper, building from git seems to require m4/perl tools which are difficult to get on Windows without msys2, so that breaks the "out of the box" experience. I don't know enough about glibmm to understand why they are needed.