$NetBSD: patch-ac,v 1.3 2017/12/15 16:11:11 jperkin Exp $

Look for dlpi before bpf, SunOS has both but this package assumes
bpf is only on BSD systems and tries to use sysctl etc.

--- configure.orig	2001-01-17 20:59:33.000000000 +0000
+++ 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
@@ -958,7 +958,7 @@ fi
 
 
 
-if test $ac_cv_prog_gcc = yes; then
+if test $ac_cv_prog_gcc = notyes; then
     CCOPTS='-O2 -funroll-loops -fomit-frame-pointer -Wall'
     CFLAGS="$CCOPTS"
 fi
@@ -1284,7 +1284,13 @@ 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 /usr/include/sys/dlpi.h ; then
+    LL_INT_TYPE=dlpi
+    echo "$ac_t""found dlpi" 1>&6
+    cat >> confdefs.h <<\EOF
+#define HAVE_DLPI 1
+EOF
+elif test -r /dev/bpf0 -o -r /dev/bpf -o -r /usr/include/net/bpf.h ; then
     LL_INT_TYPE=bpf
     echo "$ac_t""found bpf" 1>&6
 elif test -r /usr/include/net/pfilt.h ; then
@@ -1299,13 +1305,6 @@ elif test -r /usr/include/sys/net/nit.h
 elif test -r /usr/include/net/raw.h ; then
     LL_INT_TYPE=snoop
     echo "$ac_t""found snoop" 1>&6
-elif test -r /usr/include/sys/dlpi.h ; then
-    LL_INT_TYPE=dlpi
-    echo "$ac_t""found dlpi" 1>&6
-    cat >> confdefs.h <<\EOF
-#define HAVE_DLPI 1
-EOF
-
 elif test -r /usr/include/linux/socket.h ; then
     LL_INT_TYPE=sockpacket
     echo "$ac_t""found SOCK_PACKET" 1>&6
@@ -1416,7 +1415,7 @@ 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 "$ac_t""found bpf" 1>&6
 elif test -c /dev/enet ; then           # check again in case not readable
@@ -1577,7 +1576,7 @@ done
     BIN_PREFIX="$prefix/bin/"
     ;;
 
-*freebsd*)
+*freebsd* | *dragonfly*)
     cat >> confdefs.h <<\EOF
 #define LIBNET_BSDISH_OS 1
 EOF