One lives in hope....
- building of relevant libaries
- building of GS itself
Setting Up Mingw
a tutorial for how to set up a MINGW build environment
Follow these instructions carefully 
Get these packages from here
Download Gnome binary packages from here. Under gtk+ there is a bundle that has several you need.
and I'm currently stuck here. Running aclocal in the gnomesword directory appears to work, autoconf has an error
configure.in:48: error: possibly undefined macro: AC_PROG_INTLTOOL If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation.
and automake says
cannot open < gnome-doc-utils.make: No such file or directory
configure then gets confused on
line 2622: syntax error near unexpected token 'GNOME' 'PKG_CHECK_MODULES(GNOME, ' etc
so for some reason it isn't actually calling pkg-config
Articles found so far
- http://www.gnome-db.org/GnomeDbMinGW (has good tutorial to set up MINGW compiling on windows
- http://www.daniweb.com/forums/thread86245.html (Order of commandline options for GCC is important)
building of other GTK/Gnome projects
- http://linux.softpedia.com/get/Text-Editing-Processing/IDEs/MinGW-Developer-Studio-14939.shtml Allows compiling and cross compiling of GTK applications