+extern void make_foreground_application ();
+#ifdef DCPOMATIC_DISK
+extern boost::filesystem::path disk_writer_path ();
+#endif
+#ifdef DCPOMATIC_WINDOWS
+extern void maybe_open_console ();
+#endif
+extern boost::filesystem::path resources_path ();
+extern boost::filesystem::path xsd_path ();
+extern FILE * fopen_boost (boost::filesystem::path, std::string);
+extern int dcpomatic_fseek (FILE *, int64_t, int);
+extern void start_batch_converter ();
+extern void start_player ();
+extern uint64_t thread_id ();
+extern int avio_open_boost (AVIOContext** s, boost::filesystem::path file, int flags);
+extern boost::filesystem::path home_directory ();
+extern std::string command_and_read (std::string cmd);
+extern bool running_32_on_64 ();
+extern void unprivileged ();
+extern boost::filesystem::path config_path ();
+extern boost::filesystem::path directory_containing_executable ();
+
+class PrivilegeEscalator
+{
+public:
+ PrivilegeEscalator ();
+ ~PrivilegeEscalator ();
+};
+
+/** @class Waker
+ * @brief A class which tries to keep the computer awake on various operating systems.
+ *
+ * Create a Waker to prevent sleep, and call nudge() every so often (every minute or so).
+ * Destroy the Waker to allow sleep again.
+ */
+class Waker
+{
+public:
+ Waker ();
+ ~Waker ();
+
+ void nudge ();
+
+private:
+ boost::mutex _mutex;