Dev talk:Mingw installation
From Synfig Studio :: Documentation
Without cairomm installed from the gtkmm package, I saw this error:
$ pkg-config --cflags gtkmm-2.4 Package cairomm-1.0 was not found in the pkg-config search path. Perhaps you should add the directory containing `cairomm-1.0.pc' to the PKG_CONFIG_PATH environment variable Package 'cairomm-1.0', required by 'gdkmm', not found
so I added cairomm to the list of elements from gtkmm which are needed.