12794417:12.1.0: relink error

When applying patch 12794417:12.1.0: ORACLE APPLICATIONS RELEASE 12.1: CPU PATCH FOR OCT 2011, the following erroroccurs during relink,

ERROR
------------

Relinking module 'adadmin' in product ad ...

make -f /u_ts1/apps/apps_st/appl/admin/TS1/out/link_ad_18185.mk
/u_ts1/apps/apps_st/appl/ad/12.0.0/bin/adadmin

Starting  link of ad executable 'adadmin' on Fri Oct 26 16:16:09 PDT 2012
make: *** No rule to make target
`/u_ts1/apps/apps_st/appl/ad/12.0.0/lib/adadmin.o', needed by
`/u_ts1/apps/apps_st/appl/ad/12.0.0/bin/adadminnew'.  Stop.
Done with link of ad executable 'adadmin' on Fri Oct 26 16:16:09 PDT 2012

Relink of module "adadmin" failed.