pkg/29678: devel/libnet fails to build: no low level packet interface

[j+nbsd%2005.salmi.ch@localhost]

>Number:         29678
>Category:       pkg
>Synopsis:       devel/libnet fails to build: no low level packet interface
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 12 14:58:00 +0000 2005
>Originator:     Jukka Salmi
>Release:        NetBSD 2.99.16
>Environment:
System: NetBSD moray.salmi.ch 2.99.16 NetBSD 2.99.16 (GENERIC.APM) #1: Thu Mar 
3 12:32:39 CET 2005 
build%moray.salmi.ch@localhost:/build/nbsd/i386/sys/arch/i386/compile/GENERIC.APM
 i386
Architecture: i386
Machine: i386
>Description:
Using current pkgsrc, devel/libnet fails to build because configure can't find
a low level packet interface.
>How-To-Repeat:
$ cd pkgsrc/devel/libnet && make
[..]
checking low-level packet interface type... configure: warning: could not find 
a low level packet interface
configure: warning: low level packet creation API will not be added to the 
library
[...]
checking for sys/sockio.h... grep: conftest.out: No such file or directory
yes
[...]
ln -s ../libnet_error.o src
make: don't know how to make src/libnet_link_null.o. Stop

make: stopped in /build/pkg/devel/libnet/work/Libnet-1.0.1b
*** Error code 2

Stop.
[...]

>Fix:
Unknown