$ wget https://www.x.org/releases/individual/proto/xextproto-7.3.0.tar.gz
$ tar xvf xextproto-7.3.0.tar.gz 
$ cd xextproto-7.3.0/
$ mkdir build
$ cd build
$ ../configure --prefix=/opt/xorg/xextproto/7.3.0
$ make
$ make install