diff -rupN --no-dereference giflib-5.2.2/doc/Makefile giflib-5.2.2-new/doc/Makefile
--- giflib-5.2.2/doc/Makefile	2024-02-18 19:15:05.000000000 +0100
+++ giflib-5.2.2-new/doc/Makefile	2025-04-15 16:56:27.252074979 +0200
@@ -1,7 +1,7 @@
 .SUFFIXES: .xml .html .txt .adoc .1 .7
 
 .xml.html:
-	xmlto xhtml-nochunks $<
+	xmlto --stringparam generate.consistent.ids=1 xhtml-nochunks $<
 
 .xml.1:
 	xmlto man $<