title: Installing ggbiplot from github
body: <p>I'm trying to install development version of <a href="https://github.com/vqv/ggbiplot" rel="nofollow">ggbiplot</a>from <code>Github</code>. During installation I'm getting the following error message:</p>
  
  <pre><code>library(devtools)
  install_github("ggbiplot", "vqv")
  
  
  Installing github repo(s) ggbiplot/master from vqv
  Installing ggbiplot.zip from https://github.com/vqv/ggbiplot/zipball
  Installing ggbiplot
  * checking for file 'C:\Users\Muhammad Yaseen\AppData\Local\Temp\Rtmpsx4n5u\vqv-ggbiplot-2623d7c/DESCRIPTION' ... OK
  * preparing 'ggbiplot':
  * checking DESCRIPTION meta-information ... OK
  * checking for LF line-endings in source and make files
  * checking for empty or unneeded directories
  * looking to see if a 'data/datalist' file should be added
  * building 'ggbiplot_0.5.tar.gz'
  cygwin warning:
    MS-DOS style path detected: C:/Users/MUHAMM~1/AppData/Local/Temp/Rtmpsx4n5u/ggbiplot_0.5.tar.gz
    Preferred POSIX equivalent is: /cygdrive/c/Users/MUHAMM~1/AppData/Local/Temp/Rtmpsx4n5u/ggbiplot_0.5.tar.gz
    CYGWIN environment variable option "nodosfilewarning" turns off this warning.
    Consult the user's guide for more details about POSIX paths:
      http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
  
  Warning: invalid package 'Yaseen/R/win-library/2.14'
  Error: ERROR: cannot cd to directory 'C:/Users/Muhammad'
  Error: Command failed (1)
  In addition: Warning message:
  running command '"C:/PROGRA~1/R/R-214~1.2/bin/i386/R" CMD INSTALL C:\Users\MUHAMM~1\AppData\Local\Temp\Rtmpsx4n5u/ggbiplot_0.5.tar.gz --library=C:/Users/Muhammad Yaseen/R/win-library/2.14' had status 1 
  </code></pre>
  
  <p>Any idea to figure out this problem. Thanks in advance for your help and time.</p>
  
  <p><strong>Edit</strong></p>
  
  <p>After downloading from Github, also tried</p>
  
  <pre><code>install.packages("vqv-ggbiplot-2623d7c.tar.gz", repos=NULL, type="source")
  </code></pre>
  
  <p>which produced this error message</p>
  
  <pre><code>Installing package(s) into ‘C:/Users/Muhammad Yaseen/R/win-library/2.14’
  (as ‘lib’ is unspecified)
  Error in untar2(tarfile, files, list, exdir) : unsupported entry type 'g'
  Warning messages:
  1: running command 'C:/PROGRA~1/R/R-214~1.2/bin/i386/R CMD INSTALL -l "C:/Users/Muhammad Yaseen/R/win-library/2.14"   "vqv-ggbiplot-2623d7c.tar.gz"' had status 1 
  2: In install.packages("vqv-ggbiplot-2623d7c.tar.gz", repos = NULL,  :
    installation of package ‘vqv-ggbiplot-2623d7c.tar.gz’ had non-zero exit status
  </code></pre>