I would like to propose Ccache be added to the default packages installed when the user installs AUR support. It has a number of advantages over not having it, and as far as I can tell, other than a disk space penalty over time, doesn’t have any disadvantages, either.

Enabling it in the installer would be as simple as installing ccache and removing the ! before !ccache in makepkg.

It works by caching the results of compiling, and re-using those results for future compiles - if a file has already been compiled (same hash), then simply re-use the existing code, saving a LOT of time on larger pieces of software.

For example, Compiling OpenRCT2 without Ccache on my system takes about 5 minutes. With Ccache, it takes under 1 minute.