ports/154353: [PATCH] make nmap jail builds happy

[Mars G Miro]

>Number:         154353
>Category:       ports
>Synopsis:       [PATCH] make nmap jail builds happy
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jan 28 10:10:12 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Mars G Miro
>Release:        FreeBSD 8.2-RC2/amd64
>Organization:
Organization of Redundant Organizations
>Environment:
FreeBSD spry.XXX.XXX 8.2-RC2 FreeBSD 8.2-RC2 #0: Tue Jan 18 14:54:28 PHT 2011     root at spry.XXX.XXX:/usr/obj/usr/src/sys/SPRY  amd64
>Description:
This has to do w/ building nmap on a jail. A jail normally does not have a bpf device, so the configure sets ac_cv_dnet_bsd_bpf=no. If you're like me building stuff in jails and packaging them to another machine, the resulting nmap package is b0rk, e.g. 
....
  Starting Nmap 5.36TEST4 ( http://nmap.org ) at 2011-01-28 17:38 PHT
Warning: Unable to open interface em0 -- skipping it.
Warning: Unable to open interface em0 -- skipping it.
Warning: Unable to open interface em0 -- skipping it.
Warning: Unable to open interface em0 -- skipping it.
Warning: Unable to open interface em0 -- skipping it.
WARNING: Unable to find appropriate interface for system route to X.X.X.X
nexthost: failed to determine route to X.X.X.X
QUITTING!
..

This is much like these PRs:
http://www.freebsd.org/cgi/query-pr.cgi?pr=123213
http://www.freebsd.org/cgi/query-pr.cgi?pr=113893
http://www.freebsd.org/cgi/query-pr.cgi?pr=125001

>How-To-Repeat:
build nmap in jail, then pkg_create it. pkg_add package on another machine, run nmap
>Fix:
Patch libdnet-stripped/configure to remove any BPF checks

Patch attached with submission follows:

--- libdnet-stripped/configure.orig	2010-05-08 05:08:32.000000000 +0800
+++ libdnet-stripped/configure	2011-01-28 17:16:00.000000000 +0800
@@ -14342,11 +14342,7 @@
     if test "${ac_cv_dnet_bsd_bpf+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
-  if test -c /dev/bpf0 ; then
-	    ac_cv_dnet_bsd_bpf=yes
-	else
-	    ac_cv_dnet_bsd_bpf=no
-	fi
+    ac_cv_dnet_bsd_bpf=yes
 fi
 
     { $as_echo "$as_me:$LINENO: result: $ac_cv_dnet_bsd_bpf" >&5


>Release-Note:
>Audit-Trail:
>Unformatted: