These packages are out-dated and build from a disabled/not maintained repository
https://aur.archlinux.org/packages/phasex-dev/ https://aur.archlinux.org/packages/phasex-dev-git/
and should probably deleted from the AUR
They are replaced by these packages:
build from a tar ball https://aur.archlinux.org/packages/phasex/
build from the new repository https://aur.archlinux.org/packages/phasex-git/