Trying to build a flatpak for my app, but it needs inkscape in order to build the app (obviously not a dependency of the app at runtime, just a build time). inkscape is installed on the host system, but I understand that flatpak-builder cannot run commands from the host. Can I depend on https://flathub.org/apps/details/org.inkscape.Inkscape somehow? Or do I have to build all of Inkscape from source just to build my app?