--- id3lib-3.8.3/examples/test_io.cpp.old	2003-03-02 00:23:00.000000000 +0000
+++ id3lib-3.8.3/examples/test_io.cpp	2018-03-25 19:10:54.891043851 +0000
@@ -11,6 +11,9 @@
 #include <id3/io_strings.h>
 #include <id3/utils.h>
 
+using std::cin;
+using std::dec;
+using std::hex;
 using std::cout;
 using std::endl;
 using std::cerr;