[R] cannot load shared object /usr/lib/R/library/grDevices/libs//cairo.so

[beltrand]

Hi, I am trying to test out the scripts here as a proof of concept

http://www.r-bloggers.com/integrating-php-and-r/

However, I am not able to reproduce the output graph in the browser.
Rscripts is working fine as I run the command 
"Rscript /home/username/R/testscript.R 1000"  for example, and a png graph
is output as expected, and I can output it to any folder where I have
permission by changing testscript.R. 

However I am not able to get the output on the browser.I checked the web
root on my test server (xampp for Linux) and found that a pdf file is
created instead (Rplots.pdf)

I checked xampp's error log and found these, I think it is the reason why a
png graph is not created by using php's exec() command.
"unable to load shared object '/usr/lib/R/library/grDevices/libs//cairo.so':
  /usr/lib/i386-linux-gnu/libfontconfig.so.1: undefined symbol:
FT_Select_Size"

I notice that  there are two forward slashes in "..grDevices/libs//cairo.so"
whereas it should be just "..grDevices/libs/cairo.so"
I am wondering if this is a problem. Also it seemed to be working before. It
somehow stops today.

I am using Ubuntu 11.04 and R 2.14.2 (from this ppa
https://launchpad.net/~marutter/+archive/rrutter)
and my test server is xampp for Linux, I would appreciate any help. Thank
you. 

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