"make install" error: No module raid5 found for kernel 2.5.56

Any ideas about the following problem?

The following error shows up at the end of "make install" after a successful make and make modules_install. I've tried making with raid5 both modular and compiled in and with various combinations of other raid module options. Same error each time. Also tried after a make mrproper.

This is with stock 2.5.56 on a Redhat 8.0 box with the 0.9.8 module-init-tools

============================================
<....>
Kernel: arch/i386/boot/bzImage is ready
sh arch/i386/boot/install.sh 2.5.56 arch/i386/boot/bzImage System.map "" No module raid5 found for kernel 2.5.56
make[1]: *** [install] Error 1
make: *** [install] Error 2