title: Error installing leaflet package for R in ubuntu
body: <p>I can't install the leaflet packages for R in ubuntu. I've correctly install R and I was able to install some other packages like "RCurl" but I cannot install leaflet... Here are the output I get :</p>
  
  <pre><code>install.packages("leaflet",dep=T)
  Installing package into ‘/usr/local/lib/R/site-library’
  (as ‘lib’ is unspecified)
  Warning: dependency ‘plyr’ is not available
  also installing the dependencies ‘scales’, ‘rgdal’
  
  trying URL 'http://cran.univ-lyon1.fr/src/contrib/scales_0.3.0.tar.gz'
  Content type 'application/x-gzip' length 57030 bytes (55 Kb)
  opened URL
  ==================================================
  downloaded 55 Kb
  
  trying URL 'http://cran.univ-lyon1.fr/src/contrib/rgdal_1.1-3.tar.gz'
  Content type 'application/x-gzip' length 1647483 bytes (1.6 Mb)
  opened URL
  ==================================================
  downloaded 1.6 Mb
  
  trying URL 'http://cran.univ-lyon1.fr/src/contrib/leaflet_1.0.0.tar.gz'
  Content type 'application/x-gzip' length 401681 bytes (392 Kb)
  opened URL
  ==================================================
  downloaded 392 Kb
  
  ERROR: dependency ‘plyr’ is not available for package ‘scales’
  * removing ‘/usr/local/lib/R/site-library/scales’
  * installing *source* package ‘rgdal’ ...
  ** package ‘rgdal’ successfully unpacked and MD5 sums checked
  configure: CC: gcc -std=gnu99
  configure: CXX: g++
  configure: rgdal: 1.1-3
  checking for /usr/bin/svnversion... no
  configure: svn revision: 594
  checking for gdal-config... no
  no
  configure: error: gdal-config not found or not executable.
  ERROR: configuration failed for package ‘rgdal’
  * removing ‘/usr/local/lib/R/site-library/rgdal’
  ERROR: dependency ‘scales’ is not available for package ‘leaflet’
  * removing ‘/usr/local/lib/R/site-library/leaflet’
  
  The downloaded source packages are in
      ‘/tmp/Rtmp9C0NCQ/downloaded_packages’
  Warning messages:
  1: In install.packages("leaflet", dep = T) :
    installation of package ‘scales’ had non-zero exit status
  2: In install.packages("leaflet", dep = T) :
    installation of package ‘rgdal’ had non-zero exit status
  3: In install.packages("leaflet", dep = T) :
    installation of package ‘leaflet’ had non-zero exit status
  </code></pre>
  
  <p>It looks like this is a dependencies problem but I did try to install it with install.packages("leaflet",dep=T). Do you have a idea ?</p>