-using lyx::support::ascii_lowercase;
-using lyx::support::compare_ascii_no_case;
-using lyx::support::compare_no_case;
-using lyx::support::contains;
+namespace lyx {
+
+using support::ascii_lowercase;
+using support::compare_ascii_no_case;
+using support::compare_no_case;
+using support::contains;
+using support::FileName;