[pptp-server] unresolved symbols in ppp.o using kernel 2.2.19 (redhat)

[Nelson Vieira]

After performing the configuration steps listed at the end of this messaege
I'm getting the following unresolved symbols in ppp.o:

( in /usr/src/linux/drivers/net )
depmod -e ppp.o slhc.o ppp_mppe.o bsd_comp.o ppp_deflate.o
depmod: *** Unresolved symbols in ppp.o
depmod:         n_tty_ioctl
depmod:         __wake_up
depmod:         __kfree_skb
depmod:         alloc_skb
depmod:         skb_under_panic
depmod:         unregister_netdev
depmod:         tty_register_ldisc
depmod:         request_module
depmod:         register_netdev
depmod:         dev_alloc_name
depmod:         interruptible_sleep_on
depmod:         __pollwait
depmod:         kill_fasync
depmod:         netif_rx
depmod:         skb_over_panic
depmod:         tty_hung_up_p
ppp.o:  slhc.o

slhc.o:

ppp_mppe.o:     ppp.o

bsd_comp.o:     ppp.o

ppp_deflate.o:  ppp.o

------------------------------------

Here's my configuration:
- redhat 6.2 with kernel-headers-2.2.19-6.2.1.i386.rpm and
kernel-source-2.2.19-6.2.1.i386.rpm installed to /usr/src/linux
- ppp-2.3.11 installed to /usr/src/ppp-2.3.11

------------------------------------

The configuration steps:

cd /usr/src/ppp-2.3.11
patch -p1 < ppp-2.3.11-openssl-0.9.5-mppe.patch
patch -p1 < applied mppe-chapv1-fix.diff
./configure
make
make kernel
make install

( editted /usr/src/linux/include/linux/if_ppp.h and added the following:
   #define PPP_MAGIC 0x5002
   #define PPP_VERSION "2.3.11" )

cd /usr/src/linux
patch -p1 rcv_proto_unknown.patch (as explained in
http://mirror.binarix.com/ppp-mppe/README)
patch -p1 if_ppp_2.2.17.diff (addresses "structure has no member named
`tty_pushing'" errors)
make modules SUBDIRS=drivers/net

------------------------------------

Am I missing something? Could the fact that I'm using a redhat kernel source
be causing the problems?

Thanks in advance!