don't check for netinet/if_ether.h, we don't include it and it causes
configure warnings on many systems
diff --git a/configure.in b/configure.in
index 9691067..2e28a40 100644
--- a/configure.in
+++ b/configure.in
@@ -632,7 +632,6 @@
         arpa/inet.h \
         net/if.h \
         netinet/in.h \
-	netinet/if_ether.h \
         netdb.h \
         sys/select.h \
         sys/socket.h \