IBM PCI Hotplug driver doesn't compile in 2.4.19-pre4

[Adrian Bunk]

Building a kernel with the IBM PCI Hotplug driver statically included
fails at the final linking stage with a:

<--  snip  -->

...
drivers/hotplug/vmlinux-obj.o: In function `ibmphp_configure_card':
drivers/hotplug/vmlinux-obj.o(.text+0x13734): undefined reference to `ibmphp_pci_root_ops'
drivers/hotplug/vmlinux-obj.o(.text+0x137a8): undefined reference to `ibmphp_pci_root_ops'
drivers/hotplug/vmlinux-obj.o(.text+0x137c5): undefined reference to `ibmphp_pci_root_ops'
drivers/hotplug/vmlinux-obj.o(.text+0x139bf): undefined reference to `ibmphp_pci_root_ops'
drivers/hotplug/vmlinux-obj.o(.text+0x13beb): undefined reference to `ibmphp_pci_root_ops'
drivers/hotplug/vmlinux-obj.o(.text+0x14018): more undefined references to `ibmphp_pci_root_ops' follow
...

<--  snip  -->

cu
Adrian