diff --git a/edit/edit.h b/edit/edit.h
index 028ab6e1c..6b393eb6c 100644
--- a/edit/edit.h
+++ b/edit/edit.h
@@ -315,8 +315,6 @@ int edit_execute_cmd (WEdit * edit, int command, int char_for_insertion);
 
 #define color_palette(x) win->color[x].pixel
 
-extern char *home_dir;
-
 #define NUM_SELECTION_HISTORY 64
 
 #ifndef MAX_PATH_LEN
diff --git a/edit/syntax.c b/edit/syntax.c
index 68492aa4e..7cd564d8e 100644
--- a/edit/syntax.c
+++ b/edit/syntax.c
@@ -497,8 +497,6 @@ static void get_args (char *l, char **args, int *argc)
 #define check_a {if(!*a){result=line;break;}}
 #define check_not_a {if(*a){result=line;break;}}
 
-int try_alloc_color_pair (char *fg, char *bg);
-
 static int
 this_try_alloc_color_pair (char *fg, char *bg)
 {
diff --git a/src/cmd.c b/src/cmd.c
index e7cb218cd..838cf7730 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -83,19 +83,7 @@ int source_route = 0;
 /* If set, use the builtin editor */
 int use_internal_edit = 1;
 
-/* Ugly hack in order to distinguish between left and right panel in menubar */
-int is_right;
-#define MENU_PANEL_IDX  (is_right ? 1 : 0)
 
-
-/* view_file (filename, normal, internal)
- *
- * Inputs:
- *   filename:   The file name to view
- *   plain_view: If set does not do any fancy pre-processing (no filtering) and
- *               always invokes the internal viewer.
- *   internal:   If set uses the internal viewer, otherwise an external viewer.
- */
 int
 view_file_at_line (char *filename, int plain_view, int internal,
 		   int start_line)
@@ -169,6 +157,14 @@ view_file_at_line (char *filename, int plain_view, int internal,
     return move_dir;
 }
 
+/* view_file (filename, plain_view, internal)
+ *
+ * Inputs:
+ *   filename:   The file name to view
+ *   plain_view: If set does not do any fancy pre-processing (no filtering) and
+ *               always invokes the internal viewer.
+ *   internal:   If set uses the internal viewer, otherwise an external viewer.
+ */
 int
 view_file (char *filename, int plain_view, int internal)
 {
diff --git a/src/dir.h b/src/dir.h
index 1c4a1c5e9..08d479662 100644
--- a/src/dir.h
+++ b/src/dir.h
@@ -83,7 +83,6 @@ int if_link_is_exe (char *full_name, file_entry *file);
 
 extern int show_backups;
 extern int show_dot_files;
-extern int show_backups;
 extern int mix_all_files;
 
 #endif	/* __DIR_H */
diff --git a/src/dlg.c b/src/dlg.c
index b02f08ffe..8bfe4a180 100644
--- a/src/dlg.c
+++ b/src/dlg.c
@@ -59,8 +59,6 @@ static void slow_box (Dlg_head *h, int y, int x, int ys, int xs)
 /* draw box in window */
 void draw_box (Dlg_head *h, int y, int x, int ys, int xs)
 {
-    extern int slow_terminal;
-
     if (slow_terminal){
 	slow_box (h, y, x, ys, xs);
 	return;
diff --git a/src/file.h b/src/file.h
index cd96ec674..3a304ac50 100644
--- a/src/file.h
+++ b/src/file.h
@@ -39,8 +39,6 @@ extern int file_op_compute_totals;
 
 /* Query routines */
 
-extern int background_wait;
-
 int is_wildcarded (char *p);
 void compute_dir_size (char *dirname, off_t *ret_marked, double *ret_total);
 
diff --git a/src/main.c b/src/main.c
index f0abbf180..ae4fa9b38 100644
--- a/src/main.c
+++ b/src/main.c
@@ -118,6 +118,9 @@ struct WMenu *the_menubar;
 /* Pointers to the selected and unselected panel */
 WPanel *current_panel = NULL;
 
+/* Set if the command is being run from the "Right" menu */
+int is_right;
+
 /* Set when main loop should be terminated */
 volatile int quit = 0;
 
diff --git a/src/main.h b/src/main.h
index ce5936ece..30c2616b5 100644
--- a/src/main.h
+++ b/src/main.h
@@ -47,7 +47,6 @@ extern int clear_before_exec;
 extern int mou_auto_repeat;
 extern char *other_dir;
 extern int mouse_move_pages;
-extern int mouse_move_pages_viewer;
 
 #ifdef HAVE_CHARSET
 extern int source_codepage;
@@ -79,16 +78,16 @@ extern int searching;
 extern int vfs_use_limit;
 extern int alternate_plus_minus;
 extern int only_leading_plus_minus;
-extern int ftpfs_directory_timeout;
 extern int output_starts_shell;
 extern int midnight_shutdown;
 extern char search_buffer [256];
 extern char cmd_buf [512];
 extern char *cmdline_geometry;
 
-/* The menu panels */
+/* Ugly hack in order to distinguish between left and right panel in menubar */
 extern int is_right;		/* If the selected menu was the right */
 #define MENU_PANEL (is_right ? right_panel : left_panel)
+#define MENU_PANEL_IDX  (is_right ? 1 : 0)
 #define SELECTED_IS_PANEL (get_display_type (is_right ? 1 : 0) == view_listing)
 
 typedef void (*key_callback) ();
@@ -161,7 +160,6 @@ void edition_post_exec (void);
 
 void done_menu (void);
 void init_menu (void);
-void exec_shell (void);
 
 #ifdef NATIVE_WIN32
 #    define MC_BASE ""
diff --git a/src/menu.c b/src/menu.c
index 1c45a997f..8fd36852e 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -31,7 +31,6 @@
 #include "win.h"
 #include "key.h"	/* For mi_getch() */
 
-extern int is_right;
 int menubar_visible = 1;	/* This is the new default */
 
 static void
diff --git a/src/option.c b/src/option.c
index ff73c0de7..55b32b25e 100644
--- a/src/option.c
+++ b/src/option.c
@@ -48,8 +48,6 @@ static int r_but;
 
 #define TOGGLE_VARIABLE 0
 
-extern int use_internal_edit;
-
 static int first_width, second_width;
 static char *title1, *title2, *title3;
 
diff --git a/src/panelize.c b/src/panelize.c
index 83af892cd..6e56c1ec6 100644
--- a/src/panelize.c
+++ b/src/panelize.c
@@ -45,11 +45,8 @@
 #include "panel.h"		/* Needed for the externs */
 #include "file.h"
 #include "main.h"
-#include "../vfs/vfs.h"
 #include "panelize.h"
 
-void do_external_panelize (char *command);
-
 #define UX		5
 #define UY		2
 
diff --git a/src/slint.c b/src/slint.c
index b077f00bb..acade058d 100644
--- a/src/slint.c
+++ b/src/slint.c
@@ -71,7 +71,6 @@ static int slinterrupt;
 static int no_slang_delay;
 
 /* {{{  Copied from ../slang/slgetkey.c, removed the DEC_8Bit_HACK, */
-extern unsigned int SLang_Input_Buffer_Len;
 extern unsigned char SLang_Input_Buffer [];
 #if SLANG_VERSION >= 10000
 extern unsigned int _SLsys_getkey (void);
@@ -172,9 +171,6 @@ got_interrupt (void)
 void
 slang_init (void)
 {
-    extern int SLtt_Blink_Mode;
-    extern int SLtt_Has_Alt_Charset;
-    extern int force_ugly_line_drawing;
     struct sigaction act, oact;
     
     SLtt_get_terminfo ();
diff --git a/src/view.h b/src/view.h
index dd8839e12..15c97e65f 100644
--- a/src/view.h
+++ b/src/view.h
@@ -10,7 +10,6 @@ int view_init (WView *view, char *_command, const char *_file,
 	       int start_line);
 
 void view_update_bytes_per_line (WView *view);
-int view_file (char *filename, int normal, int internal);
 
 /* Command: view a file, if _command != NULL we use popen on _command */
 /* move direction should be apointer that will hold the direction in which the user */
diff --git a/vfs/ftpfs.c b/vfs/ftpfs.c
index a93d4fda0..be695211e 100644
--- a/vfs/ftpfs.c
+++ b/vfs/ftpfs.c
@@ -107,8 +107,6 @@ int ftpfs_first_cd_then_ls;
 /* Use the ~/.netrc */
 int use_netrc = 1;
 
-extern char *home_dir;
-
 /* Anonymous setup */
 char *ftpfs_anonymous_passwd = NULL;
 int ftpfs_directory_timeout = 900;
@@ -153,7 +151,7 @@ static char reply_str [80];
 
 static char *ftpfs_get_current_directory (vfs *me, vfs_s_super *super);
 static int ftpfs_chdir_internal (vfs *me, vfs_s_super *super, char *remote_path);
-static int command (vfs *me, vfs_s_super *super, int wait_reply, char *fmt, ...)
+static int command (vfs *me, vfs_s_super *super, int wait_reply, const char *fmt, ...)
     __attribute__ ((format (printf, 4, 5)));
 static int ftpfs_open_socket (vfs *me, vfs_s_super *super);
 static int login_server (vfs *me, vfs_s_super *super, const char *netrcpass);
@@ -313,7 +311,7 @@ reconnect (vfs *me, vfs_s_super *super)
 }
 
 static int
-command (vfs *me, vfs_s_super *super, int wait_reply, char *fmt, ...)
+command (vfs *me, vfs_s_super *super, int wait_reply, const char *fmt, ...)
 {
     va_list ap;
     char *str, *fmt_str;
diff --git a/vfs/vfs.c b/vfs/vfs.c
index 09c1a176b..1a537b6b9 100644
--- a/vfs/vfs.c
+++ b/vfs/vfs.c
@@ -54,13 +54,9 @@
 #   include "tcputil.h"
 #endif
 
-extern int get_other_type (void);
-
 int vfs_timeout = 60; /* VFS timeout in seconds */
 static int vfs_flags = 0;    /* Flags */
 
-extern int cd_symlinks; /* Defined in main.c */
-
 /* They keep track of the current directory */
 static vfs *current_vfs = &vfs_local_ops;
 static char *current_dir = NULL;
@@ -1794,7 +1790,7 @@ error:
 }
 
 void
-vfs_die (char *m)
+vfs_die (const char *m)
 {
     message_1s (1, _("Internal error:"), m);
     exit (1);
diff --git a/vfs/vfs.h b/vfs/vfs.h
index b21ca4873..ab10dd22a 100644
--- a/vfs/vfs.h
+++ b/vfs/vfs.h
@@ -203,7 +203,6 @@
 	int mc_link     (const char *name1, const char *name2);
         int mc_mknod    (char *, int, int);
 	int mc_rename   (const char *original, const char *target);
-	int mc_write    (int fd, char *buf, int nbyte);
         int mc_rmdir    (char *path);
         int mc_mkdir    (char *path, mode_t mode);
 
@@ -318,7 +317,7 @@ extern int vfs_parse_filetype (char c);
 extern int vfs_parse_filemode (const char *p);
 extern int vfs_parse_filedate(int idx, time_t *t);
 
-extern void vfs_die (char *msg);
+extern void vfs_die (const char *msg);
 extern char *vfs_get_password (char *msg);
 
 /* Flags for vfs_split_url() */