diff --git a/ChangeLog b/ChangeLog
index 95335ff1..c4ff0392 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,22 @@
+2008-01-06  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* libmisc/obscure.c: Tag the `old' parameter of palindrome(),
+	similar(), and simple() as unused.
+	* libmisc/loginprompt.c: Tag the `sig' parameter of login_exit()
+	as unused.
+	* src/expiry.c: Tag the `sig' parameter of catch_signals() as
+	unused.
+	* src/su.c: Tag the `sig' parameter of catch_signals() as unused.
+	* src/su.c: Add int parameter to the prototype of oldsig().
+	* src/login.c: Tag the `sig' parameter of alarm_handler() as
+	unused.
+	* src/sulogin.c: Tag the `sig' parameter of catch_signals() as
+	unused.
+	* libmisc/getdate.y: Tag the `string' parameter of yyerror() as
+	unused.
+	* libmisc/getdate.y: The string provided to yyerror() is const.
+	* libmisc/getdate.y: Fix the prototypes of yylex() and yyerror().
+
 2008-01-06  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* lib/defines.h: Remove teh macro definition of SETXXENT_TYPE,
diff --git a/libmisc/getdate.y b/libmisc/getdate.y
index 134b3f19..11579f37 100644
--- a/libmisc/getdate.y
+++ b/libmisc/getdate.y
@@ -112,8 +112,8 @@
 #define yytable  gd_yytable
 #define yycheck  gd_yycheck
 
-static int yylex ();
-static int yyerror (char *s);
+static int yylex (void);
+static int yyerror (const char *s);
 
 #define EPOCH		1970
 #define HOUR(x)		((x) * 60)
@@ -595,8 +595,7 @@ static TABLE const MilitaryTable[] = {
 
 
 
-/* ARGSUSED */
-static int yyerror (char *s)
+static int yyerror (unused const char *s)
 {
   return 0;
 }
@@ -762,7 +761,7 @@ static int LookupWord (char *buff)
 }
 
 static int
-yylex ()
+yylex (void)
 {
   register char c;
   register char *p;
diff --git a/libmisc/loginprompt.c b/libmisc/loginprompt.c
index b908f5ff..825c3d23 100644
--- a/libmisc/loginprompt.c
+++ b/libmisc/loginprompt.c
@@ -37,7 +37,8 @@
 #include "prototypes.h"
 #include "defines.h"
 #include "getdef.h"
-static void login_exit (int sig)
+
+static void login_exit (unused int sig)
 {
 	exit (1);
 }
diff --git a/libmisc/obscure.c b/libmisc/obscure.c
index 1a931d42..541526b7 100644
--- a/libmisc/obscure.c
+++ b/libmisc/obscure.c
@@ -47,7 +47,7 @@
 /*
  * can't be a palindrome - like `R A D A R' or `M A D A M'
  */
- /*ARGSUSED*/ static int palindrome (const char *old, const char *new)
+static int palindrome (unused const char *old, const char *new)
 {
 	int i, j;
 
@@ -64,7 +64,7 @@
  * more than half of the characters are different ones.
  */
 
- /*ARGSUSED*/ static int similar (const char *old, const char *new)
+static int similar (const char *old, const char *new)
 {
 	int i, j;
 
@@ -91,7 +91,7 @@
  * a nice mix of characters.
  */
 
- /*ARGSUSED*/ static int simple (const char *old, const char *new)
+static int simple (unused const char *old, const char *new)
 {
 	int digits = 0;
 	int uppers = 0;
diff --git a/src/expiry.c b/src/expiry.c
index f1aeb1db..1a66d7f5 100644
--- a/src/expiry.c
+++ b/src/expiry.c
@@ -44,7 +44,7 @@ static void usage (void);
 /*
  * catch_signals - signal catcher
  */
-static RETSIGTYPE catch_signals (int sig)
+static RETSIGTYPE catch_signals (unused int sig)
 {
 	exit (10);
 }
diff --git a/src/login.c b/src/login.c
index f78c568c..8dcb755c 100644
--- a/src/login.c
+++ b/src/login.c
@@ -290,7 +290,7 @@ static void init_env (void)
 }
 
 
-static RETSIGTYPE alarm_handler (int sig)
+static RETSIGTYPE alarm_handler (unused int sig)
 {
 	fprintf (stderr, _("\nLogin timed out after %d seconds.\n"), timeout);
 	exit (0);
diff --git a/src/su.c b/src/su.c
index 9917a2cc..ac5e483a 100644
--- a/src/su.c
+++ b/src/su.c
@@ -164,7 +164,7 @@ static void su_failure (const char *tty)
 
 #ifdef USE_PAM
 /* Signal handler for parent process later */
-static void catch_signals (int sig)
+static void catch_signals (unused int sig)
 {
 	++caught;
 }
@@ -316,7 +316,7 @@ int main (int argc, char **argv)
 #else				/* !USE_PAM */
 	int err = 0;
 
-	RETSIGTYPE (*oldsig) ();
+	RETSIGTYPE (*oldsig) (int);
 	int is_console = 0;
 
 	struct spwd *spwd = 0;
diff --git a/src/sulogin.c b/src/sulogin.c
index bc1b119d..99efc781 100644
--- a/src/sulogin.c
+++ b/src/sulogin.c
@@ -61,7 +61,7 @@ extern char **environ;
 /* local function prototypes */
 static RETSIGTYPE catch_signals (int);
 
-static RETSIGTYPE catch_signals (int sig)
+static RETSIGTYPE catch_signals (unused int sig)
 {
 	exit (1);
 }