The purpose of this is to enable Arch users to install the past official release of TrenchBroom, version 2023.1, the same way the AUR did.
To install TB in your Arch distro of choice from a terminal :
git clone https://github.com/eGax/arch-pkgbuild-trenchbroom.git
cd arch-pkgbuild-trenchbroom
makepkg -si
That will clone it, enter it, look for the required libtinyxml2.so.9, if not found then create a symlink from current /usr/lib/libtinyxml2.so.10.0.0 to /usr/lib/libtinyxml2.so.9, then installs the package into your system.
I highly recommend you use the current TrenchBroom version at this time 2024.1 using the AUR trenchbroom-bin https://aur.archlinux.org/packages/trenchbroom-bin
** If this breaks, its a very low priority to fix it since it is an out of date version, but you can create a issue and I will look into when I can. **