mtree group ?

[Sahil R Cooner]

I get the following error after running
#make installkernel
-----------------------------------------
--------------------------------------------------------------
 >>> Making hierarchy
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cd /usr/src;  MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=i386  
MACHINE=i386  CPUTYPE=p4  
GROFF_BIN_PATH=/usr/obj/usr/src/i386/legacy/usr/bin  
GROFF_FONT_PATH=/usr/obj/usr/src/i386/legacy/usr/share/groff_font  
GROFF_TMAC_PATH=/usr/obj/usr/src/i386/legacy/usr/share/tmac 
PATH=/usr/obj/usr/src/i386/legacy/usr/sbin:/usr/obj/usr/src/i386/legacy/usr/bin:/usr/obj/usr/src/i386/legacy/usr/games:/usr/obj/usr/src/i386/usr/sbin:/usr/obj/usr/src/i386/usr/bin:/usr/obj/usr/src/i386/usr/games:/sbin:/bin:/usr/sbin:/usr/bin 
/usr/obj/usr/src/make.i386/make -f Makefile.inc1 hierarchy
cd /usr/src/etc;                /usr/obj/usr/src/make.i386/make distrib-dirs
mtree -eU  -f /usr/src/etc/mtree/BSD.root.dist -p /
mtree -eU  -f /usr/src/etc/mtree/BSD.var.dist -p /var
mtree: line 55: unknown group network
*** Error code 1

Stop in /usr/src/etc.
*** Error code 1