imageio configure?

Seems that I misinterpreted the Kwiki advice totally.  So I've  
tried installing libpng
and libjpeg as suggested in Stefano's developer page.  Now in /usr/ 
local/lib I have:

yzzy: otool -L libpng.dylib
libpng.dylib:
        /usr/local/lib/libpng.3.dylib (compatibility version 3.0.0,  
current version 3.0.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current  
version 1.2.2)
        /usr/lib/libmx.A.dylib (compatibility version 1.0.0,  
current version 92.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0,  
current version 88.0.0)

configure seems happy to report PNG support, but  in make I  get  
the conflict:

Error in dyn.load(x, as.logical(local), as.logical(now)) :
        unable to load shared library '/Users/roger/Rinstall/R- 
devel/library/grDevices/libs/grDevices.so':
  dlopen(/Users/roger/Rinstall/R-devel/library/grDevices/libs/ 
grDevices.so, 6): Symbol not found: __cg_png_destroy_write_struct
  Referenced from: /System/Library/Frameworks/ 
ApplicationServices.framework/Versions/A/Frameworks/ 
ImageIO.framework/Versions/A/ImageIO
  Expected in: /usr/local/lib/libPng.dylib
Execution halted


I would be happy to follow the suggestion in the Kwiki to:

    use static libraries for libjpeg, libpng and friends

If only I knew how to implement it.  Sorry,  to be a bit dense  
about all this.

Roger


url:    www.econ.uiuc.edu/~roger            Roger Koenker
email    rkoenker@uiuc.edu            Department of Economics
vox:     217-333-4558                University of Illinois
fax:       217-244-6678                Champaign, IL 61820


On May 26, 2005, at 11:02 AM, Simon Urbanek wrote:

Roger,

On May 26, 2005, at 11:07 AM, roger koenker wrote:

I wonder if someone   could elaborate on the ./configure magic  
needed to find the libPng  in the imageio framework.

Even if you find it, it won't help unless you write a wrapper  
dylib, because the symbol names are different (they start with  
cg_). In addition, there are no header files for those private  
frameworks, either, so you won't be able to compile any code  
against it unless you make your own.

Cheers,
Simon