--- include/mbedtls/config.h.orig	2017-03-29 12:55:55.677132417 +0200
+++ include/mbedtls/config.h	2017-03-29 12:56:09.476057072 +0200
@@ -2109,7 +2109,7 @@
  * This module enables SSL/TLS PKCS #11 smartcard support.
  * Requires the presence of the PKCS#11 helper library (libpkcs11-helper)
  */
-//#define MBEDTLS_PKCS11_C
+#define MBEDTLS_PKCS11_C
 
 /**
  * \def MBEDTLS_PKCS12_C