[R] Issues in installing rgl in Mac OS 10.6.8

[A Ezhil]

Dear All,

I am trying to install rgl on my mac notebook from the source file. I tried using: /usr/bin/R64 CMD INSTALL rgl_0.92.798.tar.gz and get the following
error message:

checking for X... no
configure: error: X11 not found but required, configure aborted.
ERROR: configuration failed for package ‘rgl’
* removing
‘/Library/Frameworks/R.framework/Versions/2.14/Resources/library/rgl’
* restoring previous
‘/Library/Frameworks/R.framework/Versions/2.14/Resources/library/rgl’

I do see a directory X11 installed under /usr and Sys.getenv("PATH") inside R gives me: [1] "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin"

Could you please hep me to install rgl package?

> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

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

Thanks in advance.
Kind regards,
Ezhil