# pwd
/usr/src
# patch -p0 < /root/patches/4.0/common/010_m_dup1.patch  
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Apply by doing:
|        cd /usr/src
|        patch -p0 < 010_m_dup1.patch
|
|And then rebuild your kernel.
|
|Index: uipc_mbuf2.c
|===================================================================
|RCS file: /cvs/src/sys/kern/uipc_mbuf2.c,v
|retrieving revision 1.24
|retrieving revision 1.24.2.1
|diff -u -r1.24 -r1.24.2.1
|--- uipc_mbuf2.c       17 Mar 2006 04:15:51 -0000      1.24
|+++ uipc_mbuf2.c       7 Mar 2007 19:21:48 -0000       1.24.2.1
--------------------------
File to patch: