Good Morning:
 
I need to construct a set of Thiessen Polygons centered around  
approximately 4500 longlat positions in the US.  After searching the R  site, I was 
going to attempt to use the arealsubPolygons function in the  hydrosanity 
package.  I am using a Windows system.  
 
When attempting to call the package I get the following error messages  
under both R2.8.1 and R2.9.0.
##################################################################
> require(hydrosanity)
Loading required package:  hydrosanity
Loading required package: playwith
Loading required package:  lattice
Loading required package: cairoDevice
Error in inDL(x,  as.logical(local), as.logical(now), ...) : 
unable to load shared  library  
'C:/PROGRA~1/R/R-28~1.1/library/cairoDevice/libs/cairoDevice.dll':
LoadLibrary failure:  The specified module could not be found.
 

Error: package 'cairoDevice' could not be  loaded
###################################################################
I have tried downloading the package and it's dependencies from  several 
locations and get the same errors each time.
 
Any suggestions with respect to this package or others that I might  use to 
construct my polygons would be appreciated.  I need a set  of polygons that 
cover the entire US county polygon.  
 
Joe 
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