--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,9 @@ LDLIBS += `pkg-config --libs openssl`
 
 reglib.o: keys-ssl.c
 
-else
+endif
+
+ifeq ($(USE_GCRYPT),1)
 CFLAGS += -DUSE_GCRYPT
 LDLIBS += -lgcrypt