title: installation of package ‘devtools’ had non-zero exit status on Ubuntu
body: <p>I'm trying to install devtools in a PowerPC with a R version 3.1.1 but failed at the end because the curl library:</p>
  
  <pre><code>...
  ** testing if installed package can be loaded Error in dyn.load(file, DLLpath = DLLpath, ...) :    unable to load shared object '/path
  to/R/powerpc-unknown-linux-gnu-library/3.1/curl/libs/curl.so':   /path
  to/R/powerpc-unknown-linux-gnu-library/3.1/curl/libs/curl.so:
  undefined symbol: BSWAP_32 Error: loading failed Execution halted
  ERROR: loading failed
   * removing ‘/path to/R/powerpc-unknown-linux-gnu-library/3.1/curl’ ERROR: dependency ‘curl’ is not available for package ‘httr’
   * removing ‘/path to/R/powerpc-unknown-linux-gnu-library/3.1/httr’ ERROR: dependency ‘curl’ is not available for package ‘rversions’
   * removing ‘/path to/R/powerpc-unknown-linux-gnu-library/3.1/rversions’ ERROR:
  dependencies ‘httr’, ‘rversions’ are not available for package
  ‘devtools’
  * removing ‘/path to/R/powerpc-unknown-linux-gnu-library/3.1/devtools’
  
  The downloaded source packages are in
   ‘/tmp/RtmpD0yE63/downloaded_packages’ Warning messages: 1: In
  install.packages("devtools") :   installation of package ‘curl’ had
  non-zero exit status 2: In install.packages("devtools") :  
  installation of package ‘httr’ had non-zero exit status 3: In
  install.packages("devtools") :   installation of package ‘rversions’
  had non-zero exit status 4: In install.packages("devtools") :  
  installation of package ‘devtools’ had non-zero exit status
  </code></pre>
  
  <p>I've already installed libcurl4-gnutls-dev and libcurl4-openssl-dev and the libcurl version is 7.38.0.</p>
  
  <p>Does anyone know a fix to this? Thanks ;)</p>