$NetBSD: patch-ac,v 1.1.1.1 2007/02/18 18:36:21 adrianp Exp $

--- configure.orig	2001-01-18 09:59:33.000000000 +1300
+++ configure
@@ -506,7 +506,7 @@ fi
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
-ac_cpp='$CPP $CPPFLAGS'
+ac_cpp='${CC-cc} -E $CPPFLAGS'
 ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
 ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
 cross_compiling=$ac_cv_prog_cc_cross
@@ -778,7 +778,7 @@ echo "configure:778: checking whether th
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
-ac_cpp='$CPP $CPPFLAGS'
+ac_cpp='${CC-cc} -E $CPPFLAGS'
 ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
 ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
 cross_compiling=$ac_cv_prog_cc_cross
@@ -806,7 +806,7 @@ fi
 rm -fr conftest*
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
-ac_cpp='$CPP $CPPFLAGS'
+ac_cpp='${CC-cc} -E $CPPFLAGS'
 ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
 ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
 cross_compiling=$ac_cv_prog_cc_cross
@@ -1284,7 +1284,7 @@ fi
 echo $ac_n "checking low-level packet interface type""... $ac_c" 1>&6
 echo "configure:1286: checking low-level packet interface type" >&5
 
-if test -r /dev/bpf0 ; then
+if test -r /dev/bpf0 -o -r /dev/bpf -o -r /usr/include/net/bpf.h ; then
     LL_INT_TYPE=bpf
     echo "$ac_t""found bpf" 1>&6
 elif test -r /usr/include/net/pfilt.h ; then
@@ -1416,7 +1416,7 @@ fi
 
 
     fi
-elif test -c /dev/bpf0 ; then           # check again in case not readable
+elif test -c /dev/bpf0 -o -c /dev/bpf ; then           # check again in case not readable
     LL_INT_TYPE=bpf
     echo "$ac_t""found bpf" 1>&6
 elif test -c /dev/enet ; then           # check again in case not readable
@@ -1577,7 +1577,7 @@ done
     BIN_PREFIX="$prefix/bin/"
     ;;
 
-*freebsd*)
+*freebsd* | *dragonfly*)
     cat >> confdefs.h <<\EOF
 #define LIBNET_BSDISH_OS 1
 EOF