Comment 3 for bug 1753068

Patch for building the dependency, spice-gtk from https://anonscm.debian.org/git/collab-maint/spice-gtk.git. This disables werror to fix the cast errors and disables building html docs to fix a file not found error during dh_install. Tested on spice-gtk 0.34-1.
Apply the patch, commit, (optionally run "debchange -l +gitxyz") and build with "dpkg-buildpackage -rfakeroot -us -uc".
You need to build and install libspice-protocol-dev from https://anonscm.debian.org/git/collab-maint/spice-protocol.git before building spice-gtk.