I know the latest Neofetch is available in the official arch repository but I want to build it from the git clone. Since it doesn't have the PKGBUILD so makepkg is out of question and the global step ( make install) doesn't do anything. I have read that Yaourt compiles it with makepkg. But how to do that without any AUR helper?
You could get the neofetch git AUR package, which is called
neofetch-git. You can install it with an AUR helper, or if you want to build manually:
git clone https://aur.archlinux.org/neofetch-git.git
Or, you can build directly from git:
git clone https://github.com/dylanaraps/neofetch.git
make && sudo make install