--- a/pppd/Makefile.linux
+++ b/pppd/Makefile.linux
@@ -49,7 +49,8 @@ MPPE=y
 # Uncomment the next line to include support for PPP packet filtering.
 # This requires that the libpcap library and headers be installed
 # and that the kernel driver support PPP packet filtering.
-#FILTER=y
+# libpcap statically linked in OpenWRT, hence disabled here.
+FILTER=
 
 # Support for precompiled filters
 PRECOMPILED_FILTER=y