diff --git a/ChangeLog b/ChangeLog
index ca8803a6..c4405a3f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-01-01  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* libmisc/limits.c, libmisc/obscure.c, src/login_nopam.c,
+	lib/pwauth.c: Avoid empty file when USE_PAM is set.
+	* src/login_nopam.c: Fix warnings: resolve_hostname takes and
+	returns a constant string.
+
 2008-01-01  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* src/grpck.c: Split process_flags(), open_files(), and
diff --git a/libmisc/limits.c b/libmisc/limits.c
index 80c23f77..c211f58b 100644
--- a/libmisc/limits.c
+++ b/libmisc/limits.c
@@ -441,4 +441,6 @@ void setup_limits (const struct passwd *info)
 	}
 }
 
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
 #endif				/* !USE_PAM */
diff --git a/libmisc/obscure.c b/libmisc/obscure.c
index 27f15a75..1a931d42 100644
--- a/libmisc/obscure.c
+++ b/libmisc/obscure.c
@@ -289,4 +289,6 @@ int obscure (const char *old, const char *new, const struct passwd *pwdp)
 	return 1;
 }
 
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
 #endif				/* !USE_PAM */
diff --git a/src/login_nopam.c b/src/login_nopam.c
index 720a55e0..bc2f75d5 100644
--- a/src/login_nopam.c
+++ b/src/login_nopam.c
@@ -245,8 +245,8 @@ static int user_match (const char *tok, const char *string)
 	return (NO);
 }
 
-static char *resolve_hostname (string)
-char *string;
+static const char *resolve_hostname (string)
+const char *string;
 {
 	/*
 	 * Resolve hostname to numeric IP address, as suggested
@@ -314,4 +314,6 @@ static int string_match (const char *tok, const char *string)
 	return (NO);
 }
 
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
 #endif				/* !USE_PAM */