#define IPTOS_THROUGHPUT 0x08
#define IPTOS_RELIABILITY 0x04
#endif
-#define _PATH_DHCPD_PID "/etc/dhcpd.pid"
-#define _PATH_DHCLIENT_PID "/etc/dhclient.pid"
-#define _PATH_DHCLIENT_PID "/etc/dhcrelay.pid"
+
+#if !defined (_PATH_DHCPD_PID)
+# define _PATH_DHCPD_PID "/etc/dhcpd.pid"
+#endif
+
+#if !defined (_PATH_DHCLIENT_PID)
+# define _PATH_DHCLIENT_PID "/etc/dhclient.pid"
+#endif
+
+#if !defined (_PATH_DHCRELAY_PID)
+# define _PATH_DHCRELAY_PID "/etc/dhcrelay.pid"
+#endif
+
/* Stdarg definitions for ANSI-compliant C compilers. */
#import <stdarg.h>
#define VA_DOTDOTDOT ...