make: Fatal error: Don't know how to make target '$FND_TOP/lib/wfresgcp.o'

While applying patches on a cloned instance the relink of WFRESGEN failed with following error on the web tier:

make -f $APPL_TOP/admin/$TWO_TASK/out/link_fnd_24844.mk $FND_TOP/bin/WFRESGEN

Starting link of fnd executable 'WFRESGEN' on Fri Mar 28 16:21:26 EDT 2008
make: Fatal error: Don't know how to make target `$FND_TOP/lib/wfresgcp.o'
Done with link of fnd executable 'WFRESGEN' on Fri Mar 28 16:21:26 EDT 2008

Relink of module "WFRESGEN" failed.

There was no file called $FND_TOP/lib/wfresgcp.o. To fix this I copied this file from the concurrent tier to the web tier. Relink of WFRESGEN completed successfully after this.