• using R Under development (unstable) (2012-02-24 r58481)
• using platform: x86_64-pc-mingw32 (64-bit)
• using session charset: ISO8859-1
• checking for file 'excel.link/DESCRIPTION' ... OK
• checking extension type ... Package
• this is package 'excel.link' version '0.5'
• checking package namespace information ... OK
• checking package dependencies ... ERROR
  Package required but not available: 'RDCOMClient'
  
  See the information on DESCRIPTION files in the chapter 'Creating R
  packages' of the 'Writing R Extensions' manual.