Comment # 1 on bug 76320 from Matt Turner

Totally related:

man/Makefile.am:
# String replacements in MAN_SUBSTS now come from xorg-macros.m4 via configure
SUFFIXES = .$(APP_MAN_SUFFIX) .man

You do realize that xorg-macros is just a m4 file full of autoconf convenience
macros, right? Using it isn't actually relying on xorg to function.