How do I install xorg-macros?

I'm trying to build xf86-input-libinput from source to apply a patch. When I follow the recipe given here at the step autoreconf -vif I get an error saying:

configure.ac:41: error: must install xorg-macros 1.8 or later before running autoconf/autogen

I've tried sudo apt-get install xorg-macros to no avail (unable to find source package). How can I install xorg-macros?