upgrading coreutils

[deva seetharam]

hello,i am using MacPorts on OS X 10.6.8.
i ran sudo port upgrade outdated. i get the ":info:configure configure.ac:21: error: Autoconf version 2.64 or higher is required" error when the coreutils package is getting upgraded. 
however, when i run autoconf --version, i get the following response:"autoconf (GNU Autoconf) 2.68"
it seems like port upgrade is picking up the wrong autoconf. how to resolve this? kindly advise. 
thanks in advance. Dave
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