/usr/lib/xemacs-21.4.22/x86_64-linux-gnu/include/s/domain.h is in xemacs21-bin 21.4.22-4ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | /* Synched up with: FSF 19.31. */
#include "bsd4-3.h"
/* Inhibit using -X, which is the default. */
#define LD_SWITCH_SYSTEM
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