--- modules/Makefile.in
+++ modules/Makefile.in
@@ -166,6 +166,7 @@
 		echo $(INSTALL_MODULE) $(OBJDIR)/$$i $(DEST_MODULEDIR); \
 		$(INSTALL_MODULE) $(OBJDIR)/$$i $(DEST_MODULEDIR); \
 	done
+ifdef INSTALL_MODULES_SHELL_RELATED_FILES
 	-$(MKINSDIR) $(DEST_SLSH_DIR)
 	@for i in $(SLFILES); \
 	do \
@@ -181,18 +182,23 @@
 		$(INSTALL_DATA) $$i $(DEST_SLSH_DIR)/$$d/; \
 	   done; \
 	done
+endif
+ifdef INSTALL_MODULES_MAP_FILES
 	-$(MKINSDIR) $(DEST_CMAPSDIR)
 	@for i in cmaps/*.map; \
 	do \
 		echo $(INSTALL_DATA) $$i $(DEST_CMAPSDIR); \
 		$(INSTALL_DATA) $$i $(DEST_CMAPSDIR); \
 	done
+endif
+ifdef INSTALL_MODULES_HELP_FILES
 	-$(MKINSDIR) $(DEST_HELPDIR)
 	@for i in help/*.hlp; \
 	do \
 		echo $(INSTALL_DATA) $$i $(DEST_HELPDIR); \
 		$(INSTALL_DATA) $$i $(DEST_HELPDIR); \
 	done
+endif
 runtests: all
 	@test_scripts="$(TEST_SCRIPTS)"; \
 	test -z "@PNG_MODULE@" || test_scripts="$$test_scripts test_png.sl"; \