Re: [R] RGL on Mac OS X

From: Matthew Cohen <>
Date: Fri 02 Jul 2004 - 02:40:59 EST

I should have included in my last message a reference to the discussion of this issue on the R developers' list:

Here, Simon Urbanek says:

>In Mac OS X native version: The R shell wrapper (bin/R) overrides default
>library search path with DYLD_LIBRARY_PATH and adds (among others)
>/usr/X11R6/lib. This causes problems when modules need (directly or
>indirectly) libraries from Apple's frameworks which are masked by X11.
>Examples for such packages are SJava and RGL. SJava needs JavaVM which in
>turn loads OpenGL framework. RGL needs the OpenGL framework directly. The
>problem is that specifying /usr/X11R6/lib in DYLD_LIBRARY_PATH forces the
>libGL to be loaded from the X11 directory instead of the OpenGL framework
>library. This crashes R due to missing symbols, since the modules must link
>to the OpenGL framework. In fact the OpenGL framework libraries load the
>X11 libraries internally (but not vice versa) - that's why the default load
>path is frameworks first then X11.

He suggests a temporary workaround:

>Currently a workaround is to remove /usr/X11R6/lib in R from the
>environment variable prior to loading those packages, but more general
>solution would be better imho. Is the /usr/X11R6/lib really necessary in
>the DYLD_LIBRARY_PATH for some older OS X versions? At least for OS X 10.2
>with Apple's X11 it is not necessary since X11 is already in the default
>load path.

Clearly the "more general solution" was never arrived at, given that the problem still exists. So how, exactly, do I go about implementing this workaround? In other words, where is the "usr/X11R6/lib" path included in R, and how do I remove it? (and, if necessary, how do I put it back afterwards?)

Also, in case it is needed, here is what typing "library(rgl)" returns in R:

>Error in dyn.load(x, as.logical(local), as.logical(now)) :
> unable to load shared library
> dlcompat: dyld: /usr/local/lib/R/bin/R.bin Undefined symbols:
>Error in library(rgl) : .First.lib failed

Any help would be very much appreciated. Also, apologies for sending out two messages asking the same question in such a short span of time, but I realized after sending that I did not include all of the relevant information in the first.


Guide! mailing list PLEASE do read the posting guide! Received on Fri Jul 02 02:45:03 2004

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