Index: asterisk-trunk/res/res_config_odbc.c
===================================================================
--- asterisk-trunk/res/res_config_odbc.c	(revision 217558)
+++ asterisk-trunk/res/res_config_odbc.c	(working copy)
@@ -903,9 +903,15 @@
 				case SQL_CHAR:
 				case SQL_VARCHAR:
 				case SQL_LONGVARCHAR:
+#ifdef SQL_WCHAR
+				/* Older ODBC headers do not define these
+				 * unicode types - only use them if they're
+				 * available.
+				 */
 				case SQL_WCHAR:
 				case SQL_WVARCHAR:
 				case SQL_WLONGVARCHAR:
+#endif
 				case SQL_BINARY:
 				case SQL_VARBINARY:
 				case SQL_LONGVARBINARY: