• using R version 2.14.1 (2011-12-22)
• using platform: i386-apple-darwin9.8.0 (32-bit)
• using session charset: ASCII
• checking for file 'classGraph/DESCRIPTION' ... OK
• checking extension type ... Package
• this is package 'classGraph' version '0.7-4'
• checking package namespace information ... OK
• checking package dependencies ... ERROR
  Package required but not available: 'Rgraphviz'
  
  See the information on DESCRIPTION files in the chapter 'Creating R
  packages' of the 'Writing R Extensions' manual.
• elapsed time (check, wall clock): 0:01