--- a/Makefile
+++ b/Makefile
@@ -120,7 +120,7 @@
 
 crypt: crypt.o
 	@echo Linking $< ...
-	@$(CC) $(CFLAGS) -o $@ $<
+	@$(CC) $(CFLAGS) -o $@ $< -lcrypt
 
 tokenpasting: tokenpasting.o
 	@echo Linking $< ...