This doesn't match the extensions doxygen creates now.

--- libzmf-0.0.2/docs/doxygen/Makefile.am	2013-08-29 18:36:23.000000000 +0100
+++ libzmf-0.0.2/docs/doxygen/Makefile.am	2025-07-07 12:21:59.381332460 +0100
@@ -6,9 +6,7 @@
 
 install-data-am:
 	mkdir -p $(DESTDIR)$(docdir)/html
-	$(INSTALL_DATA) html/*.html $(DESTDIR)$(docdir)/html/
-	$(INSTALL_DATA) html/*.png $(DESTDIR)$(docdir)/html/
-	$(INSTALL_DATA) html/*.css $(DESTDIR)$(docdir)/html/
+	$(INSTALL_DATA) html/* $(DESTDIR)$(docdir)/html/
 
 uninstall-am:
 	-rm -rf $(DESTDIR)$(docdir)/html