https://lists.archlinux.org/archives/list/aur-general@lists.archlinux.org/message/HPDWM7DTGUTHLEFMH3IQGCMFTP64QFMF/
Re: [aur-general] What is pkgrel and why/how should I use it? - Aur-general - lists.archlinux.org
https://lists.archlinux.org/archives/list/pacman-dev@lists.archlinux.org/thread/HL26JTHB7Z54EUEO2IJBPDVDVBJVTMYR/
[pacman-dev] [PATCH] makepkg: strip comments after pkgver/pkgrel when checking value - Pacman-dev -...
https://lists.archlinux.org/archives/list/aur-general@lists.archlinux.org/message/B2VGIVEGS55CVK65WHC23FXVOJDCW3YG/
[aur-general] What is pkgrel and why/how should I use it? - Aur-general - lists.archlinux.org