NAMESPACE problem: import(zoo) but 'zoo' could not be loaded

Hello:


        I'm having problems creating a real NAMESPACE to replace the pro
forma one in the fda package on R-Forge.  "R CMD check" complains,
"Error: package 'zoo' could not be loaded ... there is no package called
'zoo'";  see below.  I get this both with and without "import(zoo)" in
NAMESPACE.


        Suggestions?
        Thanks,
        Spencer


p.s.  The current code including this problem can be obtained through
anonymous access via "svn checkout
svn://svn.r-forge.r-project.org/svnroot/fda/".


C:\Users\sgraves\2012\R_pkgs\fda>R CMD check fda_2.3.3.tar.gz
* using log directory 'C:/Users/sgraves/2012/R_pkgs/fda/fda.Rcheck'
* using R version 2.15.2 (2012-10-26)
* using platform: i386-w64-mingw32 (32-bit)

<snip>

* checking loading without being on the library search path ... WARNING
Loading required package: splines
Loading required package: zoo
Error: package 'zoo' could not be loaded
In addition: Warning message:
In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc =
lib.loc)
   :
    there is no package called 'zoo'
Execution halted

It looks like this package has a loading problem when not on .libPaths:
see the messages for details.

  > sessionInfo()

R version 2.15.2 (2012-10-26)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

other attached packages:
[1] zoo_1.7-9

loaded via a namespace (and not attached):
[1] grid_2.15.2     lattice_0.20-10