See my AUR package.
Download/extract the tarball
$ tar zxvf ttf-fonts-1.0.tar.gz
or clone the repo to your local machine
$ git clone https://github.com/veltall/ttf-fonts.git
allow the files to be read by users
$ chmod 0555 ./fonts
$ chmod 0444 .fonts/*.ttf
copy the .ttf files to your font folder(s), consult the wiki for more details
$ cd fonts
# cp *.ttf /usr/share/fonts/TTF
$ cp ~/.local/share/fonts
Then update the fontconfig font cache
$ fc-cache