title: Error loading rgdal
body: <p>I have successfully installed the <code>rgdal</code> package along with the dependencies GDAL and Proj4. After installation I succesfully loaded the package in R with the <code>library</code> function. However after my most recent login when i type in the command <code>library(rgdal)</code> I get an error message:</p>
  
  <pre><code>Error: package or namespace load failed for 'rgdal' in dyn.load(file, 
  DLLpath = DLLpath, ...):
  unable to load shared object '/home/nikhail1/R/x86_64-pc-linux-gnu-
  library/3.4/rgdal/libs/rgdal.so':
  libgdal.so.20: cannot open shared object file: No such file or directory
  </code></pre>
  
  <p>I understand this means there is no link to the libgdal file but I am not sure how to fix it. libgdal.so.20 is in the system under /home/nikhail1/bin/gdal/lib/. The rgdal.so file is under the rgdal folder in the R library in my /home/nikhail1/ system. I do not have the authority to perform an <code>ldconfig</code> function on shared libraries (I am a novice). Does anyone have a function that could help me make the system recognize the pathway to libgdal.so.20. I am working on a Linux CentOs 6.9 system. I cannot perform any <code>sudo apt-get</code>, <code>yum</code> or <code>brew</code> functions.</p>
  
  <p>Many thanks, Nikhail</p>