title: How to install flatpak build dependencies?
body: <p>Trying to build a flatpak for my app, but it needs <code>inkscape</code> in order to build the app (obviously not a dependency of the app at runtime, just a build time).  <code>inkscape</code> is installed on the host system, but I understand that <code>flatpak-builder</code> cannot run commands from the host.  Can I depend on <a href="https://flathub.org/apps/details/org.inkscape.Inkscape" rel="nofollow noreferrer">https://flathub.org/apps/details/org.inkscape.Inkscape</a> somehow?  Or do I have to build all of Inkscape from source just to build my app?</p>