FabioLolix [1] filed a deletion request for php-gtk-git [2]:
Dead projetc targeting old version of PHP (5.5) and GTK2 (2.24.10), no
other packages use this, upstream build instructions and files are
broken.
> $ ./buildconf
make[1]: *** No rule to make target 'configure.in', needed by
'aclocal.m4'. Stop.
[1] https://aur.archlinux.org/account/FabioLolix/
[2] https://aur.archlinux.org/pkgbase/php-gtk-git/