Hi Amin


> > checking for curl-config... no
> > Cannot find curl-config
> > ERROR: configuration failed for package 'RCurl'
> > ** Removing '/usr/lib/R/library/RCurl'
>

You need libcurl development libraries installed.

On Ubuntu 8.04, IIRC, using libcurl4-openssl-dev worked fine for me:
Install on apt supported system:
sudo apt-get install licurl4-openssl-dev

Hope that helps,

Arnar

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