RH kernel 2.2.19-6.2.7, md_setup_drive, reference undefined

[Jim Rankin]

When I attempt to build a custom version of the Red Hat kernel 2.2.19-6.2.7
in Red Hat 6.2, the compile aborts with

init/main.o(.data.init+0x13c): undefined reference to `md_setup'
drivers/block/block.a(genhd.o): In function `device_setup':
genhd.o(.text.init+0x13a): undefined reference to `md_setup_drive'
make: *** [vmlinux] Error 1

Anybody know what's wrong?

Jim