diff -pur dhcp-forwarder-0.7-orig/src/wrappers.h dhcp-forwarder-0.7-patched/src/wrappers.h
--- dhcp-forwarder-0.7-orig/src/wrappers.h	2004-06-22 12:46:56.000000000 +0200
+++ dhcp-forwarder-0.7-patched/src/wrappers.h	2005-12-27 12:28:10.464289435 +0100
@@ -65,7 +65,14 @@ Egetgrnam(char const *name)
    /*@*/
 {
   /*@observer@*/struct group const	*res = getgrnam(name);
-  FatalErrnoError(res==0, 1, "getgrnam()");
+
+  FatalErrnoError((res == NULL) && (errno != 0), 1, "getgrnam()");
+
+  if (res == NULL)
+  {
+    fprintf (stderr, "No such group: `%s'\n", name);
+    exit (1);
+  }
 
     /*@-freshtrans@*/
     /*@-mustfreefresh@*/
@@ -80,7 +87,14 @@ Egetpwnam(char const *name)
     /*@*/
 {
   struct passwd const	*res = getpwnam(name);
-  FatalErrnoError(res==0, 1, "getpwnam()");
+
+  FatalErrnoError((res == NULL) && (errno != 0), 1, "getpwnam()");
+
+  if (res == NULL)
+  {
+    fprintf (stderr, "No such user: `%s'\n", name);
+    exit (1);
+  }
 
   return res;
 }
