Fix dependencies
diff --git a/include/polarssl/check_config.h b/include/polarssl/check_config.h
index c4c570c..4f3e48c 100644
--- a/include/polarssl/check_config.h
+++ b/include/polarssl/check_config.h
@@ -197,6 +197,11 @@
#error "POLARSSL_RSA_C defined, but not all prerequisites"
#endif
+#if defined(POLARSSL_RSASSA_PSS_CERTIFICATES) && \
+ ( !defined(POLARSSL_RSA_C) || !defined(POLARSSL_PKCS1_V21) )
+#error "POLARSSL_RSASSA_PSS_CERTIFICATES defined, but not all prerequisites"
+#endif
+
#if defined(POLARSSL_SSL_PROTO_SSL3) && ( !defined(POLARSSL_MD5_C) || \
!defined(POLARSSL_SHA1_C) )
#error "POLARSSL_SSL_PROTO_SSL3 defined, but not all prerequisites"