diff --color -Naur dbus-1.12.20-original/doc/Makefile.in dbus-1.12.20-hacked2/doc/Makefile.in
--- dbus-1.12.20-original/doc/Makefile.in	2020-07-02 12:10:41.000000000 +0200
+++ dbus-1.12.20-hacked2/doc/Makefile.in	2020-11-07 09:57:15.297694773 +0100
@@ -870,8 +870,10 @@
 .PRECIOUS: Makefile
 
 
+# 'generate.consistent.ids=1' ensures reproducible docs, for further details see
+# http://docbook.sourceforge.net/release/xsl/current/doc/html/generate.consistent.ids.html
 @DBUS_XML_DOCS_ENABLED_TRUE@%.html: %.xml
-@DBUS_XML_DOCS_ENABLED_TRUE@	$(XMLTO) html-nochunks $<
+@DBUS_XML_DOCS_ENABLED_TRUE@	$(XMLTO) --stringparam generate.consistent.ids=1 html-nochunks $<
 
 @DBUS_XML_DOCS_ENABLED_TRUE@%.1: %.1.xml
 @DBUS_XML_DOCS_ENABLED_TRUE@	$(XMLTO) man $<