You can append the following content to /etc/pacman.conf.

[melody-flag]
SigLevel = Optional TrustedOnly
Server = http://repo.mmf.moe/$arch

In order to use this repo, you must import yesterday17.asc. You can follow the step below:

sudo pacman-key --add /path/to/yesterday17.asc
pacman-key --finger 37425538284357DE8FA65CEDE7AAA31E332F889C
pacman-key --lsign-key 37425538284357DE8FA65CEDE7AAA31E332F889C

• jlu-http-proxy

Run build.sh. Make sure you have rm, makepkg, repo-add and repo-remove.