Log Message:
Changes 2.11.1:

* R CMD INSTALL checks if dependent packages are available early on
* in the installation of source packages, thereby giving clearer
  error messages.
* R CMD INSTALL --build now names the file in the format used
  for Mac OS X binary files on that platform.
* BIC() in package stats4 now also works with multiple fitted models,
  analogously to AIC().
* Use of file extension .C for C++ code in packages is now
  deprecated: it has caused problems for some 'make's on
  case-insensitive file systems (although it currently works
  with the recommended toolkits).
* The C function mkCharLenCE now no longer reads past 'len' bytes
  (unlikely to be a problem except in user code).
* On systems without any default LD_LIBRARY_PATH (not even
  /usr/local/lib), [DY]LIB_LIBRARY_PATH is now set without a trailing colon.
* More efficient utf8ToInt() on long multi-byte strings with
  many multi-byte characters.
* aggregate.ts() gave platform-depedent results due to rounding
  error for ndeltat != 1.
* package.skeleton() sometimes failed to fix filenames for .R or
  .Rd files to start with an alphanumeric.