-AC_PATH_PROG(DHCLIENT, [dhclient])
-AC_PATH_PROG(WPASUPPLICANT, [wpa_supplicant])
+AC_PATH_PROG(UDHCPC, [udhcpc], ,$PATH:/sbin:/usr/sbin)
+AC_PATH_PROG(DHCLIENT, [dhclient], ,$PATH:/sbin:/usr/sbin)
+AC_PATH_PROG(RESOLVCONF, [resolvconf], ,$PATH:/sbin:/usr/sbin)
+AC_PATH_PROG(WPASUPPLICANT, [wpa_supplicant], ,$PATH:/sbin:/usr/sbin)
+
+AC_CHECK_LIB(dl, dlopen, dummy=yes,
+ AC_MSG_ERROR(dynamic linking loader is required))