R help - Mar 2012 - cannot load shared object /usr/lib/R/library/grDevices/libs//cairo.so

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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I have figured it out. 

It turns out that it is not a R problem. libfontconfig.so.1 links to
libfreetype, it happens that there are two sets of libfreetype files in my
system, one from Ubuntu and another from xampp. When the php script is run
to invoke R it uses the libfreetype files in /opt/lampp/lib which are out of
date, so R/cairo.so could not load. Copying the updated version of
libfreetype* from /usr/lib/i386-linux-gnu/ into /opt/lampp/lib overwritting
the outdated version solved the problem. I suppose I could also change some
environmental variables with something like export
LD_LIBRARY_PATH/usr/lib/i386-linux-gnu/



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