[R] trouble installing RCurl

[Ux.Seo]

Hi, all
I got following errors when I tried to install "RCurl" in Ubuntu. 
my R version is 

na at ubuntu:~$ R --version
R version 2.15.0 (2012-03-30)
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i686-pc-linux-gnu (32-bit)

thanks in advance


* installing *source* package ‘RCurl’ ...
** package ‘RCurl’ successfully unpacked and MD5 sums checked
checking for curl-config... no
Cannot find curl-config
ERROR: configuration failed for package ‘RCurl’
* removing ‘/home/na/R/i686-pc-linux-gnu-library/2.15/RCurl’

The downloaded source packages are in
        ‘/tmp/RtmpTdSf9C/downloaded_packages’
Warning message:
In install.packages(RCurl) :
  installation of package ‘RCurl’ had non-zero exit status

na at ubuntu:~/R/i686-pc-linux-gnu-library/2.15$ R CMD INSTALL
RCurl_1.91-1.tar.gz 
* installing to library ‘/home/na/R/i686-pc-linux-gnu-library/2.15’
* installing *source* package ‘RCurl’ ...
** package ‘RCurl’ successfully unpacked and MD5 sums checked
checking for curl-config... no
Cannot find curl-config
ERROR: configuration failed for package ‘RCurl’
* removing ‘/home/na/R/i686-pc-linux-gnu-library/2.15/RCurl’


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