$OpenBSD: patch-src_keychain_fmt_plug_c,v 1.6 2020/12/19 21:32:07 sebastia Exp $
Index: src/keychain_fmt_plug.c
--- src/keychain_fmt_plug.c.orig
+++ src/keychain_fmt_plug.c
@@ -38,6 +38,10 @@ john_register_one(&fmt_keychain);
 #include "pbkdf2_hmac_sha1.h"
 #include "jumbo.h"
 
+#ifndef C_Block
+#define C_Block DES_cblock
+#endif
+
 #define FORMAT_LABEL            "keychain"
 
 #ifdef SIMD_COEF_32
