Since all (false positives for) bashisms are gone, making the test target fail on bashisms.

Makefile

@@ -19,14 +19,13 @@ test:
 
 	@echo " done."
 
-	@# We can't just fail yet on bashisms (FIXME)
 	@echo -n "Checking for bashisms"
 
 	@if [ -x /usr/bin/checkbashisms ]; \
 	then \
 		for SCRIPT in $(SCRIPTS); \
 		do \
-			checkbashisms -f -x $${SCRIPT} || true; \
+			checkbashisms -f -x $${SCRIPT}; \
 			echo -n "."; \
 		done; \
 	else \