modprobe: Unknown symbol on 2.6.xx

I have a problem loading the required modules, see output message:

root:~# modprobe lirc_serial
lirc_dev: Unknown symbol __stack_smash_handler
lirc_dev: Unknown symbol __guard
lirc_dev: Unknown symbol _GLOBAL_OFFSET_TABLE_
WARNING: Error inserting lirc_dev 
(/lib/modules/2.6.14.6-grsec/misc/lirc_dev.ko): Unknown symbol in module, or 
unknown parameter (see dmesg)
lirc_serial: Unknown symbol __stack_smash_handler
lirc_serial: Unknown symbol __guard
lirc_serial: Unknown symbol lirc_unregister_plugin
lirc_serial: Unknown symbol _GLOBAL_OFFSET_TABLE_
lirc_serial: Unknown symbol lirc_register_plugin
FATAL: Error inserting lirc_serial 
(/lib/modules/2.6.14.6-grsec/misc/lirc_serial.ko): Unknown symbol in module, 
or unknown parameter (see dmesg)

I do not have a symlink /usr/src/linux pointing towards my hardened kernel 
source, since this 2.4 way_of_working is not advised on a 2.6 system. I have 
tried that option though, since it was mentioned in your FAQ. It didn't 
help.

So, can I check whether the Makefile is including my kernel sources?

In the Makefile I see the value 
'kerneldir=/lib/modules/2.6.14.6-grsec/build/'. That is certainly not where 
my kernel source is. Should it instead point there? If so, any help to 
replace this value in all the makefiles is appreciated.

Greets, Warren

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