[R] Loading problem with XML_1.9

[Luo Weijun]

Hello all,
I have loading problem with XML_1.9 under 64 bit
R2.3.1, which I got from http://R.research.att.com/.
XML_1.9 works fine under 32 bit R2.5.0. I thought that
could be installation problem, and I tried
install.packages or biocLite, every time the package
installed fine, except some warning messages below:
ld64 warning: in /usr/lib/libxml2.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libz.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libiconv.dylib, file does
not contain requested architecture
ld64 warning: in /usr/lib/libz.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libxml2.dylib, file does not
contain requested architecture

Here is the error messages I got, when XML is loaded:
> library(XML)
Error in dyn.load(x, as.logical(local),
as.logical(now)) : 
        unable to load shared library
'/usr/local/lib64/R/library/XML/libs/XML.so':
  dlopen(/usr/local/lib64/R/library/XML/libs/XML.so,
6): Symbol not found: _xmlMemDisplay
  Referenced from:
/usr/local/lib64/R/library/XML/libs/XML.so
  Expected in: flat namespace
Error: .onLoad failed in 'loadNamespace' for 'XML'
Error: package/namespace load failed for 'XML'

I understand that it has been pointed out that
Sys.getenv("PATH") needs to be revised in the file
XML/R/zzz.R, but I can’t even find that file under
XML/R/ directory. Does anybody have any idea what
might be the problem, and how to solve it? Thanks a
lot!
BTW, the reason I need to use R64 is that I have
memory limitation issue with R 32 bit version when I
load some very large XML trees. 

Session information
> sessionInfo()
Version 2.3.1 Patched (2006-06-27 r38447) 
powerpc64-apple-darwin8.7.0 

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices"
"utils"     "datasets" 
[7] "base"     

Weijun