I don't normally use IDE, but on occasion may want
to so I've built it as a module.
[bruce@cletus linux]$ make modules
make[1]: Entering directory `/usr/src/linux-2.1/kernel'
make[1]: Nothing to be done for `modules'.
make[1]: Leaving directory `/usr/src/linux-2.1/kernel'
make[1]: Entering directory `/usr/src/linux-2.1/drivers'
set -e; for i in block char net misc sbus scsi cdrom; do make -C $i modules; done
make[2]: Entering directory `/usr/src/linux-2.1/drivers/block'
gcc -D__KERNEL__ -I/usr/src/linux-2.1/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -D__SMP__ -pipe -fno-strength-reduce -m486 -DCPU=486 -D__SMP__ -DMODULE -c -o ide-probe.o ide-probe.c
ide-probe.c:679: `ideprobe_init' undeclared here (not in a function)
ide-probe.c:679: initializer element for `ideprobe_module.init' is not constant
make[2]: *** [ide-probe.o] Error 1
make[2]: Leaving directory `/usr/src/linux-2.1/drivers/block'
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/usr/src/linux-2.1/drivers'
make: *** [modules] Error 2
[bruce@cletus linux]$