[master] another compilation fix

1e44d65c · Tomek Mrugalski · 89394655 · 1e44d65c
Commit 1e44d65c authored Dec 24, 2014 by Tomek Mrugalski 🛰
--- a/src/lib/dhcpsrv/cfg_mac_source.h
+++ b/src/lib/dhcpsrv/cfg_mac_source.h
@@ -17,6 +17,7 @@

 #include <stdint.h>
 #include <vector>
+#include <string>

 namespace isc {
 namespace dhcp {