--- /dev/null
+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;
+ }