+FreeBSD-1.1.5.1.
+================
+
+Copy the following files to /sys/net:
+
+ net/if_ppp.h
+ net/ppp-comp.h
+ net/ppp_defs.h
+ freebsd-old/bsd-comp.c
+ freebsd-old/if_ppp.c
+ freebsd-old/if_pppvar.h
+ freebsd-old/ppp_tty.c
+ freebsd-old/slcompress.c
+ freebsd-old/slcompress.h
+
+You then need to patch /sys/conf/files using the command:
+
+ patch -p -N -d /sys/conf <freebsd-old/files.patch
+
+Then patch /sys/net/netisr.h with the command:
+
+ patch -p -N -d /sys/net <freebsd-old/netisr.h.patch
+
+The next step is to patch the file containing the code which
+dispatches software interrupts with the following command:
+
+ patch -p -N -d /sys/i386/isa <freebsd-old/icu.s.patch
+
+