R help - Oct 2013 - Assessing compiled code in base packages

I am updating a package that works previously under R.2.15.x on a Windows OS. 
When I build and run the  package with R.3.0.2.  I receive an error message like
the following: "C_call_dqags" not available for .External() for
package "stats"
How can compiled C (or Fortran) routines from package "stats" be used
in functions in a new package with R.3.0.2?
Help will be highly appreciated.
Niel

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