diff --git a/src/sys-crypto.h b/src/sys-crypto.h
new file mode 100644
index 00000000..f4ad9dc3
--- /dev/null
+++ b/src/sys-crypto.h
@@ -0,0 +1,9 @@
+#ifndef LI_SYS_CRYPTO_H
+#define LI_SYS_CRYPTO_H
+#include "first.h"
+
+#if defined HAVE_LIBSSL && defined HAVE_OPENSSL_SSL_H
+#define USE_OPENSSL_CRYPTO
+#endif
+
+#endif