I changed the source to this:
git+https://github.com/01org/libva.git#tag=libva-1.1.0
but I got these errors:
error after changing the source:
make[3]: *** [Makefile:505: libva_display_la-va_display_wayland.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/tmp/yaourt-tmp-laichiaheng/aur-libva-git/src/libva-git/test/common'
make[2]: *** [Makefile:413: all-recursive] Error 1
make[2]: Leaving directory '/tmp/yaourt-tmp-laichiaheng/aur-libva-git/src/libva-git/test'
make[1]: *** [Makefile:467: all-recursive] Error 1
make[1]: Leaving directory '/tmp/yaourt-tmp-laichiaheng/aur-libva-git/src/libva-git'
make: *** [Makefile:399: all] Error 2
==> ERROR: A failure occurred in build().
Aborting...
==> ERROR: Makepkg was unable to build libva-git.