diff --git a/defines.h b/defines.h
new file mode 100644
index 0000000..73e7919
--- /dev/null
+++ b/defines.h
@@ -0,0 +1,8 @@
+#define USG 1
+
+#define	CRYPT	1  /* file encryption enabled?                     */
+
+#define	NSTRING	128		/* # of bytes, string buffers   */
+
+#define PKCODE 1
+#define ENVFUNC 1