[569] neraka:Module$ make
make[1]: Entering directory `/usr/src/linux-2.6.21.5'
  CC [M]  /home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.o
In file included from /home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.c:50:
/home/pedro/can2/rt2500-1.1.0-b4/Module/rt_config.h:58:40: error: linux/config.h: No such file or directory
/home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.c: In function 'RT2500_open':
/home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.c:343: warning: passing argument 2 of 'request_irq' from incompatible pointer type
/home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.c: In function 'rt2500_resume':
/home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.c:947: warning: ignoring return value of 'pci_enable_device', declared with attribute warn_unused_result
make[2]: *** [/home/pedro/can2/rt2500-1.1.0-b4/Module/rtmp_main.o] Error 1
make[1]: *** [_module_/home/pedro/can2/rt2500-1.1.0-b4/Module] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.21.5'
rt2500.ko failed to build!
make: *** [module] Error 1