R12 during installation of patch 18936791(12.1 RUP4) "Relink of module "ENCACN",..failed" reported

On :  12.1.3 version, Patch Application Issues

When attempting to apply patch 18936791(12.1 RUP4),
the following error occurs.

ERROR
-----------------------
/usr/bin/ld: : No such file: No such file or directory
collect2: ld returned 1 exit status
make: *** [/oracle/ebsa/apps/apps_st/appl/wip/12.0.0/bin/WICMEX] Error 1
Done with link of wip executable 'WICMEX' on Fri Feb 27 14:32:48 CET 2015

Relink of module "WICMEX" failed.
See error messages above (also recorded in log file) for possible
reasons for the failure.  Also, please check that the Unix userid
running adrelink has read, write, and execute permissions
on the directory /oracle/ebsa/apps/apps_st/appl/wip/12.0.0/bin,