Comment 10 for bug 987962

These libraries are not built in the same environment as our regular devlibs, so I don't recommend that others try this unless they're comfortable with experimenting. These libraries were placed in the build directory post-build, NOT in my devlibs directory.

Now that you know it was not including the devel packages, the libraries at hand should be pretty straightforward from what I asked ~suv to include (as I went for most recent).

cairo = mingw32-libcairo2-1.12.0-1.5.noarch.rpm
freetype = mingw32-freetype-2.4.9-1.12.noarch.rpm
libpng = mingw32-libpng-1.5.10-1.2.noarch.rpm

Note: Your presumption was incorrect, I used 7-zip on Windows to extract the files (they're ridiculously nested in directories).