+// std::string length2string (const int32_t frames, const float sample_rate);
+std::string length2string (const int64_t frames, const double sample_rate);
+
+std::vector<std::string> internationalize (const char *, const char **);
+bool strings_equal_ignore_case (const std::string& a, const std::string& b);
+
+template <class T> std::string
+to_string (T t, std::ios_base & (*f)(std::ios_base&))
+{
+ std::ostringstream oss;
+ oss << f << t;
+ return oss.str();
+}
+
+bool string_is_affirmative (const std::string&);
+
+const char *
+sgettext (const char *, const char *);