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--- a/src/dnd.h
+++ b/src/dnd.h
@@ -35,7 +35,7 @@
     };
 
     /* Drag data format listing for gtk_drag_dest_set() */
-   GtkTargetEntry _gmtp_drop_types[3];
+    extern GtkTargetEntry _gmtp_drop_types[3];
 
 #define gmtp_drag_dest_set(widget) gtk_drag_dest_set(widget, \
 		GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_DROP, \
--- a/src/interface.h
+++ b/src/interface.h
@@ -108,12 +108,12 @@
     };
 
     // Main Window widgets
-    GtkListStore *fileList;
-    GtkTreeStore *folderList;
-    GtkTreeSelection *fileSelection;
-    GtkTreeSelection *folderSelection;
-    gulong folderSelectHandler;
-    gulong fileSelectHandler;
+    extern GtkListStore *fileList;
+    extern GtkTreeStore *folderList;
+    extern GtkTreeSelection *fileSelection;
+    extern GtkTreeSelection *folderSelection;
+    extern gulong folderSelectHandler;
+    extern gulong fileSelectHandler;
 
 
     /**
@@ -252,22 +252,22 @@
     void __fileMove(GtkTreeRowReference *Row);
 
     // Flags for overwriting files of host PC and device.
-    gint fileoverwriteop;
+    extern gint fileoverwriteop;
     // Flag to allow overwrite of files on device.
-    gint deviceoverwriteop;
+    extern gint deviceoverwriteop;
 
     // Find options and variables.
-    gboolean inFindMode;
-    GSList *searchList;
+    extern gboolean inFindMode;
+    extern GSList *searchList;
 
     /**
      * Destroys a file listing object.
      * @param file - pointer to the FileListStruc object.
      */
     void g_free_search(FileListStruc *file);
-    GtkWidget *FindToolbar_entry_FindText;
-    GtkWidget *FindToolbar_checkbutton_FindFiles;
-    GtkWidget *FindToolbar_checkbutton_TrackInformation;
+    extern GtkWidget *FindToolbar_entry_FindText;
+    extern GtkWidget *FindToolbar_checkbutton_FindFiles;
+    extern GtkWidget *FindToolbar_checkbutton_TrackInformation;
 
     /**
      * Add an individual file to the device.
@@ -329,77 +329,77 @@
     int32_t displayAddTrackPlaylistDialog(gboolean showNew /* = TRUE */);
 
     // Widget for find toolbar
-    GtkWidget *findToolbar;
+    extern GtkWidget *findToolbar;
 
     // Parent container for the main toolbar.
-    GtkWidget *handlebox1;
-    GtkWidget *toolbarMain;
+    extern GtkWidget *handlebox1;
+    extern GtkWidget *toolbarMain;
 
     // Widgets for menu items;
-    GtkWidget *fileConnect;
-    GtkWidget *fileAdd;
-    GtkWidget *fileDownload;
-    GtkWidget *fileRemove;
-    GtkWidget *fileRename;
-    GtkWidget *fileMove;
-    GtkWidget *fileNewFolder;
-    GtkWidget *fileRemoveFolder;
-    GtkWidget *fileRescan;
-    GtkWidget *editDeviceName;
-    GtkWidget *editFormatDevice;
-    GtkWidget *editAddAlbumArt;
-    GtkWidget *editFind;
-    GtkWidget *editSelectAll;
-    GtkWidget *contextMenu;
-    GtkWidget *contextMenuColumn;
-    GtkWidget *contestMenuFolder;
-    GtkWidget* cfileAdd;
-    GtkWidget* cfileNewFolder;
-    GtkWidget *toolbuttonAddFile;
+    extern GtkWidget *fileConnect;
+    extern GtkWidget *fileAdd;
+    extern GtkWidget *fileDownload;
+    extern GtkWidget *fileRemove;
+    extern GtkWidget *fileRename;
+    extern GtkWidget *fileMove;
+    extern GtkWidget *fileNewFolder;
+    extern GtkWidget *fileRemoveFolder;
+    extern GtkWidget *fileRescan;
+    extern GtkWidget *editDeviceName;
+    extern GtkWidget *editFormatDevice;
+    extern GtkWidget *editAddAlbumArt;
+    extern GtkWidget *editFind;
+    extern GtkWidget *editSelectAll;
+    extern GtkWidget *contextMenu;
+    extern GtkWidget *contextMenuColumn;
+    extern GtkWidget *contestMenuFolder;
+    extern GtkWidget* cfileAdd;
+    extern GtkWidget* cfileNewFolder;
+    extern GtkWidget *toolbuttonAddFile;
 #if HAVE_GTK3 == 0
-    GtkTooltips *tooltipsToolbar;
+    extern GtkTooltips *tooltipsToolbar;
 #endif
 
     // Columns in main file view;
-    GtkTreeViewColumn *column_Size;
-    GtkTreeViewColumn *column_Type;
-    GtkTreeViewColumn *column_Track_Number;
-    GtkTreeViewColumn *column_Title;
-    GtkTreeViewColumn *column_Artist;
-    GtkTreeViewColumn *column_Album;
-    GtkTreeViewColumn *column_Year;
-    GtkTreeViewColumn *column_Genre;
-    GtkTreeViewColumn *column_Duration;
-    GtkTreeViewColumn *column_Location;
+    extern GtkTreeViewColumn *column_Size;
+    extern GtkTreeViewColumn *column_Type;
+    extern GtkTreeViewColumn *column_Track_Number;
+    extern GtkTreeViewColumn *column_Title;
+    extern GtkTreeViewColumn *column_Artist;
+    extern GtkTreeViewColumn *column_Album;
+    extern GtkTreeViewColumn *column_Year;
+    extern GtkTreeViewColumn *column_Genre;
+    extern GtkTreeViewColumn *column_Duration;
+    extern GtkTreeViewColumn *column_Location;
 
     // Main menu widgets
-    GtkWidget *menu_view_filesize;
-    GtkWidget *menu_view_filetype;
-    GtkWidget *menu_view_track_number;
-    GtkWidget *menu_view_title;
-    GtkWidget *menu_view_artist;
-    GtkWidget *menu_view_album;
-    GtkWidget *menu_view_year;
-    GtkWidget *menu_view_genre;
-    GtkWidget *menu_view_duration;
-    GtkWidget *menu_view_folders;
-    GtkWidget *menu_view_toolbar;
+    extern GtkWidget *menu_view_filesize;
+    extern GtkWidget *menu_view_filetype;
+    extern GtkWidget *menu_view_track_number;
+    extern GtkWidget *menu_view_title;
+    extern GtkWidget *menu_view_artist;
+    extern GtkWidget *menu_view_album;
+    extern GtkWidget *menu_view_year;
+    extern GtkWidget *menu_view_genre;
+    extern GtkWidget *menu_view_duration;
+    extern GtkWidget *menu_view_folders;
+    extern GtkWidget *menu_view_toolbar;
 
     // Column view context menu;
-    GtkWidget* cViewSize;
-    GtkWidget* cViewType;
-    GtkWidget* cViewTrackName;
-    GtkWidget* cViewTrackNumber;
-    GtkWidget* cViewArtist;
-    GtkWidget* cViewAlbum;
-    GtkWidget* cViewYear;
-    GtkWidget* cViewGenre;
-    GtkWidget* cViewDuration;
+    extern GtkWidget* cViewSize;
+    extern GtkWidget* cViewType;
+    extern GtkWidget* cViewTrackName;
+    extern GtkWidget* cViewTrackNumber;
+    extern GtkWidget* cViewArtist;
+    extern GtkWidget* cViewAlbum;
+    extern GtkWidget* cViewYear;
+    extern GtkWidget* cViewGenre;
+    extern GtkWidget* cViewDuration;
 
     // Combobox used in AddTrackPlaylist feature.
-    GtkWidget *combobox_AddTrackPlaylist;
+    extern GtkWidget *combobox_AddTrackPlaylist;
 
-    int64_t fileMoveTargetFolder;
+    extern int64_t fileMoveTargetFolder;
 
 #ifdef  __cplusplus
 }
--- a/src/main.c
+++ b/src/main.c
@@ -26,7 +26,6 @@
 #include "mtp.h"
 
 // Global Widgets needed by various functions.
-GtkWidget *windowMain;
 GtkWidget *windowStatusBar;
 GtkWidget *toolbuttonConnect;
 GtkWidget *treeviewFiles;
--- a/src/main.h
+++ b/src/main.h
@@ -68,46 +68,46 @@
     } Device_Struct;
 
     // Main Window Widgets.
-    GtkWidget *windowMain;
-    GtkWidget *scrolledwindowMain;
+    extern GtkWidget *windowMain;
+    extern GtkWidget *scrolledwindowMain;
 
-    GtkWidget *windowStatusBar;
-    GtkWidget *toolbuttonConnect;
-    GtkWidget *treeviewFiles;
-    GtkWidget *treeviewFolders;
+    extern GtkWidget *windowStatusBar;
+    extern GtkWidget *toolbuttonConnect;
+    extern GtkWidget *treeviewFiles;
+    extern GtkWidget *treeviewFolders;
     // Folder view;
-    GtkWidget *scrolledwindowFolders;
-    GtkTreeSelection *folderSelection;
+    extern GtkWidget *scrolledwindowFolders;
+    extern GtkTreeSelection *folderSelection;
 
     // Device information struct
-    Device_Struct DeviceMgr;
+    extern Device_Struct DeviceMgr;
 
     // File/Folder/Track/Playlist pointers
-    LIBMTP_file_t *deviceFiles;
-    LIBMTP_folder_t *deviceFolders;
-    LIBMTP_track_t *deviceTracks;
-    LIBMTP_playlist_t *devicePlayLists;
-    uint32_t currentFolderID; // This is the ID of the current folder....
-    int32_t addTrackPlaylistID;
+    extern LIBMTP_file_t *deviceFiles;
+    extern LIBMTP_folder_t *deviceFolders;
+    extern LIBMTP_track_t *deviceTracks;
+    extern LIBMTP_playlist_t *devicePlayLists;
+    extern uint32_t currentFolderID; // This is the ID of the current folder....
+    extern int32_t addTrackPlaylistID;
 
-    GQueue *stackFolderIDs;
-    GQueue *stackFolderNames;
+    extern GQueue *stackFolderIDs;
+    extern GQueue *stackFolderNames;
 
     // Icon file locations.
-    gchar *file_logo_png;
-    gchar *file_icon48_png;
-    gchar *file_icon16_png;
-    gchar *file_about_png;
-    gchar *file_format_png;
+    extern gchar *file_logo_png;
+    extern gchar *file_icon48_png;
+    extern gchar *file_icon16_png;
+    extern gchar *file_about_png;
+    extern gchar *file_format_png;
     // File view Icons
-    gchar *file_audio_png;
-    gchar *file_video_png;
-    gchar *file_playlist_png;
-    gchar *file_album_png;
-    gchar *file_textfile_png;
-    gchar *file_generic_png;
-    gchar *file_folder_png;
-    gchar *file_image_png;
+    extern gchar *file_audio_png;
+    extern gchar *file_video_png;
+    extern gchar *file_playlist_png;
+    extern gchar *file_album_png;
+    extern gchar *file_textfile_png;
+    extern gchar *file_generic_png;
+    extern gchar *file_folder_png;
+    extern gchar *file_image_png;
 
     /**
      * setFilePaths - set paths for image used within gMTP
--- a/src/mtp.h
+++ b/src/mtp.h
@@ -42,7 +42,7 @@
 
 #define MTP_DEVICE_SINGLE_STORAGE -1
 
-    gboolean AlbumErrorIgnore;
+    extern gboolean AlbumErrorIgnore;
 
     typedef struct {
         gchar* file_extension;
--- a/src/preferences.h
+++ b/src/preferences.h
@@ -28,22 +28,22 @@
 #include <gtk/gtk.h>
 
     // Main preferences dialog if present.
-    GtkWidget *windowPrefsDialog;
+    extern GtkWidget *windowPrefsDialog;
 
     // Widgets for preferences buttons;
-    GtkWidget *comboboxToolbarStyle;
-    GtkWidget *checkbuttonDeviceConnect;
-    GtkWidget *entryDownloadPath;
-    GtkWidget *entryUploadPath;
-    GtkWidget *checkbuttonDownloadPath;
-    GtkWidget *checkbuttonConfirmFileOp;
-    GtkWidget *checkbuttonConfirmOverWriteFileOp;
-    GtkWidget *checkbuttonAutoAddTrackPlaylist;
-    GtkWidget *checkbuttonIgnorePathInPlaylist;
-    GtkWidget *checkbuttonSuppressAlbumErrors;
-    GtkWidget *checkbuttonAltAccessMethod;
-    GtkWidget *checkbuttonAllMediaAsFiles;
-    GtkWidget *checkbuttonRetainTimeStamp;
+    extern GtkWidget *comboboxToolbarStyle;
+    extern GtkWidget *checkbuttonDeviceConnect;
+    extern GtkWidget *entryDownloadPath;
+    extern GtkWidget *entryUploadPath;
+    extern GtkWidget *checkbuttonDownloadPath;
+    extern GtkWidget *checkbuttonConfirmFileOp;
+    extern GtkWidget *checkbuttonConfirmOverWriteFileOp;
+    extern GtkWidget *checkbuttonAutoAddTrackPlaylist;
+    extern GtkWidget *checkbuttonIgnorePathInPlaylist;
+    extern GtkWidget *checkbuttonSuppressAlbumErrors;
+    extern GtkWidget *checkbuttonAltAccessMethod;
+    extern GtkWidget *checkbuttonAllMediaAsFiles;
+    extern GtkWidget *checkbuttonRetainTimeStamp;
 
     /**
      * Callback to show the Preferences Dialog Box.
--- a/src/prefs.h
+++ b/src/prefs.h
@@ -61,7 +61,7 @@
         gboolean retain_timestamp;
     } Preferences_Struct;
 
-    Preferences_Struct Preferences;
+    extern Preferences_Struct Preferences;
 
     /**
      * Set some default values for the application prefences.
@@ -80,7 +80,7 @@
     gboolean savePreferences();
 
 #if HAVE_GTK3 == 0
-    GConfClient *gconfconnect;
+    extern GConfClient *gconfconnect;
     /**
      * The callback function for GConf.
      * @param client
@@ -90,7 +90,7 @@
      */
     void gconf_callback_func(GConfClient *client, guint cnxn_id, GConfEntry *entry, gpointer user_data);
 #else
-    GSettings *gsettings_connect;
+    extern GSettings *gsettings_connect;
     /**
      * The callback for the GSettings database.
      */
--- a/src/progress.h
+++ b/src/progress.h
@@ -27,7 +27,7 @@
 #include <gtk/gtk.h>
 #include <stdint.h>
 
-    gboolean progressDialog_killed;
+    extern gboolean progressDialog_killed;
 
     /**
      * Create a Upload/Download Progress Window.