acxz [1] filed a orphan request for gazebo-hg [2]: This package's build process is not representative of the current upstream of gazebo. The package is not building building for me and has been flagged out of data for a while now and not been fixed. As such if someone else can pick it up it would be great.
[1] https://aur.archlinux.org/account/acxz/ [2] https://aur.archlinux.org/pkgbase/gazebo-hg/
