[R] loading gap package

[Eduwin Pakpahan]

Dear R users, 
I did install R. 2.0.1, and try to load "gap" package. 
However, below is the message shown when I did load it. Can anybody
please let me know my mistakes?

----
> library()
> library(gap)
Loading required package: MASS 
Loading required package: genetics 
Loading required package: combinat 
Loading required package: gdata 
Error: package 'gdata' could not be loaded
In addition: Warning message: 
There is no package called 'gdata' in: library(pkg, character.only =
TRUE, logical = TRUE, lib.loc = lib.loc)
----

Thanks,

Edwin