title: Error when installing "devtools" package for R in Ubuntu
body: <p>Could someone help me to find out a solution to this error?</p>
  
  <blockquote>
    <p>install.packages("devtools")</p>
  </blockquote>
  
  <pre><code>  &gt; * installing *source* package ‘RCurl’ ...
      &gt; ** package ‘RCurl’ successfully unpacked and MD5 sums checked checking for curl-config... no Cannot find curl-config ERROR: configuration
      &gt; failed for package ‘RCurl’
      &gt; * removing ‘/home/juanchi/R/x86_64-pc-linux-gnu-library/3.0/RCurl’ Warning in install.packages :   installation of package ‘RCurl’ had
      &gt; non-zero exit status ERROR: dependency ‘RCurl’ is not available for
      &gt; package ‘httr’
      &gt; * removing ‘/home/juanchi/R/x86_64-pc-linux-gnu-library/3.0/httr’ Warning in install.packages :   installation of package ‘httr’ had
      &gt; non-zero exit status ERROR: dependencies ‘httr’, ‘RCurl’ are not
      &gt; available for package ‘devtools’
      &gt; * removing ‘/home/juanchi/R/x86_64-pc-linux-gnu-library/3.0/devtools’ Warning in install.packages :   installation of package ‘devtools’ had
      &gt; non-zero exit status
      &gt; 
      &gt; The downloaded source packages are in
  </code></pre>
  
  <p>print(sessionInfo(), locale=FALSE)</p>
  
  <pre><code>R version 3.0.2 (2013-09-25) Platform: x86_64-pc-linux-gnu (64-bit)
  
  attached base packages: [1] stats     graphics  grDevices utils     datasets  methods   base     
  
  loaded via a namespace (and not attached): [1] tools_3.0.2
      &gt;   ‘/tmp/RtmpDMZcfn/downloaded_packages’
  </code></pre>