Fix typos in macro names
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 2341f05..5e9df52 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -3485,7 +3485,7 @@
 #endif
         {
             /* Error out (and send alert) on invalid records */
-#if defined(POLARSSL_SSL_ALERT_MESSAGES)
+#if defined(POLARSSL_SSL_ALL_ALERT_MESSAGES)
             if( ret == POLARSSL_ERR_SSL_INVALID_MAC )
             {
                 ssl_send_alert_message( ssl,
diff --git a/library/threading.c b/library/threading.c
index fa745af..5d48516 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -105,6 +105,6 @@
 
     return( 0 );
 }
-#endif /* POLARSSL_THREADING_ALT_C */
+#endif /* POLARSSL_THREADING_ALT */
 
 #endif /* POLARSSL_THREADING_C */
diff --git a/library/version_features.c b/library/version_features.c
index b970ee1..fcda595 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -279,9 +279,9 @@
 #if defined(POLARSSL_SSL_AEAD_RANDOM_IV)
     "POLARSSL_SSL_AEAD_RANDOM_IV",
 #endif /* POLARSSL_SSL_AEAD_RANDOM_IV */
-#if defined(POLARSSL_SSL_ALERT_MESSAGES)
-    "POLARSSL_SSL_ALERT_MESSAGES",
-#endif /* POLARSSL_SSL_ALERT_MESSAGES */
+#if defined(POLARSSL_SSL_ALL_ALERT_MESSAGES)
+    "POLARSSL_SSL_ALL_ALERT_MESSAGES",
+#endif /* POLARSSL_SSL_ALL_ALERT_MESSAGES */
 #if defined(POLARSSL_SSL_DEBUG_ALL)
     "POLARSSL_SSL_DEBUG_ALL",
 #endif /* POLARSSL_SSL_DEBUG_ALL */