imageio configure?

I wonder if someone   could elaborate on the ./configure magic needed to
find the libPng  in the imageio framework.  I have built R 2.2.0 from  
source, but
without png and jpeg support and would like to rectify this, if  
possible.

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


[R-SIG-Mac] compile problem on OS 10.4, R-2.1.0

Jan de Leeuw deleeuw at stat.ucla.edu
Mon May 2 22:50:25 CEST 2005

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Using ImageIO is trivial. Just mask /usr/local during configure/
build. Starting with Tiger,  nothing in there is needed any more.

>
 >
 >> I decided to have a go compiling R 2.1.0 with the new release of
 >> 10.4. Any idea what the problem might be with this? I don't think
 >> there is anything wrong with /usr/local/lib/libpng.dylib...
 >>
 >
 > There is - it conflicts with the system one (as the error message
 > unmistakably tells you). For details see my post in response to the
 > exactly same problem described by Bill - don't use unversioned png/
 > jpeg/... libraries in /usr/local! I don't know where you get them
 > from, but they are bad. Use static libraries or correctly versioned
 > dynamic ones. The CRAN release has no such problem because the
 > libraries are properly versioned. The really clean solution is to
 > switch to ImageIO framework, but that's not quite trivial.
 >
 > Cheers,
 > Simon
 >
 > _______________________________________________
 > R-SIG-Mac mailing list
 > R-SIG-Mac at stat.math.ethz.ch
 > https://stat.ethz.ch/mailman/listinfo/r-sig-mac
 >
 >

===
Jan de Leeuw; Distinguished Professor and Chair, UCLA Department of
Statistics;
Editor: Journal of Multivariate Analysis, Journal of Statistical
Software