xproto

$ wget https://www.x.org/releases/individual/proto/xproto-7.0.31.tar.gz
$ tar xvf xproto-7.0.31.tar.gz
$ cd xproto-7.0.31/
$ mkdir build
$ cd build
$ ../configure --prefix=/opt/xorg/xproto/7.0.31
$ make
$ make install