diff --git a/test/Makefile.in b/test/Makefile.in
index 67162c48838..0be5842512f 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -341,9 +341,17 @@ mostlyclean:
 	-@for f in ${LOGFILES}; do test ! -f $$f || mv $$f $$f~; done
 	rm -f ./*.tmp
 
+# If 'find' supports -delete, it also supports -path.  Otherwise, use
+# -prune and $(FIND_DELETE) instead.  -prune is incompatible with -delete.
+ifeq ($(FIND_DELETE),-delete)
+CLEAN_XML_FILES = '(' -name '*.xml' -a ! -path '*resources*' ')' -delete
+else
+CLEAN_XML_FILES = -name '*resources*' -prune -o -name '*.xml' $(FIND_DELETE)
+endif
+
 clean:
 	find . '(' -name '*.log' -o -name '*.log~' ')' $(FIND_DELETE)
-	find . '(' -name '*.xml' -a ! -path '*resources*' ')' $(FIND_DELETE)
+	find . $(CLEAN_XML_FILES)
 	rm -f ${srcdir}/lisp/gnus/mml-sec-resources/random_seed
 	rm -f $(test_module_dir)/*.o $(test_module_dir)/*.so \
 	  $(test_module_dir)/*.dll gmp.h