xproto
The X11 Protocol: X Window System core
The X Protocol Headers for development This package provides the headers and specification documents defining the X Window System Core Protocol, Version 11.
There is no official package available for openSUSE Leap 16.0Distributions
openSUSE Leap 15.6
openSUSE Backports for SLE 15 SP4
Unsupported distributions
The following distributions are not officially supported. Use these packages at your own risk.