title: "Non Zero Exit Status" R 3.0.1 'XML' and 'RCurl'
body: <p>I am having a bit of trouble installing XML and RCurl on my Ubuntu machine 13.10. I performed all sudo update and upgrades today.</p>
  
  <p>I am trying to use rattle for R. I am unable to install 'XML' which is required for the use of rattle. This is pretty much the same question that was asked <a href="https://stackoverflow.com/questions/13846311/non-zero-exit-status-error-downloading-xml-and-rcurl-r-pacakges">right here</a> just a year later and a different OS.  Here are the error messages that I am getting back:</p>
  
  <pre><code>&gt; install.packages("RCurl")
  Installing package into ‘/home/steven/R/x86_64-pc-linux-gnu-library/3.0’
  (as ‘lib’ is unspecified)
  trying URL 'http://cran.rstudio.com/src/contrib/RCurl_1.95-4.1.tar.gz'
  Content type 'application/x-gzip' length 870915 bytes (850 Kb)
  opened URL
  ==================================================
  downloaded 850 Kb
  
  * 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/steven/R/x86_64-pc-linux-gnu-library/3.0/RCurl’
  Warning in install.packages :
    installation of package ‘RCurl’ had non-zero exit status
  
  The downloaded source packages are in
      ‘/tmp/RtmpUwBkbS/downloaded_packages’
  &gt; install.packages("XML")
  Installing package into ‘/home/steven/R/x86_64-pc-linux-gnu-library/3.0’
  (as ‘lib’ is unspecified)
  trying URL 'http://cran.rstudio.com/src/contrib/XML_3.98-1.1.tar.gz'
  Content type 'application/x-gzip' length 1582216 bytes (1.5 Mb)
  opened URL
  ==================================================
  downloaded 1.5 Mb
  
  * installing *source* package ‘XML’ ...
  ** package ‘XML’ successfully unpacked and MD5 sums checked
  checking for gcc... gcc
  checking for C compiler default output file name... 
  rm: cannot remove 'a.out.dSYM': Is a directory
  a.out
  checking whether the C compiler works... yes
  checking whether we are cross compiling... no
  checking for suffix of executables... 
  checking for suffix of object files... o
  checking whether we are using the GNU C compiler... yes
  checking whether gcc accepts -g... yes
  checking for gcc option to accept ISO C89... none needed
  checking how to run the C preprocessor... gcc -E
  checking for sed... /bin/sed
  checking for pkg-config... /usr/bin/pkg-config
  checking for xml2-config... no
  Cannot find xml2-config
  ERROR: configuration failed for package ‘XML’
  * removing ‘/home/steven/R/x86_64-pc-linux-gnu-library/3.0/XML’
  Warning in install.packages :
    installation of package ‘XML’ had non-zero exit status
  
  The downloaded source packages are in
      ‘/tmp/RtmpUwBkbS/downloaded_packages’
  </code></pre>
  
  <p>Not too sure on how to proceed from here.</p>