building R-devel on Panther

This is no problem. R does not use the Apple provided
zlib, but the dynamic linker looks there first. The second
warning would probably go away if you recompiled
readline in /usr/local (because Apple did not provide
ncurses until Panther). Anyway, there are no conflicts.

ld: warning multiple definitions of symbol _zlibVersion
/usr/lib/libz.1.dylib(zutil.o) definition of _zlibVersion
../../../bin/libR.dylib(zutil.o) definition of _zlibVersion
ld: warning multiple definitions of symbol _BC
/usr/local/lib/libreadline.4.3.dylib(terminal.so) definition of _BC
/usr/lib/libncurses.5.dylib(lib_termcap.o) definition of _BC

===
Jan de Leeuw; Professor and Chair, UCLA Department of Statistics;
Editor: Journal of Multivariate Analysis, Journal of Statistical  
Software
US mail: 8130 Math Sciences Bldg, Box 951554, Los Angeles, CA 90095-1554
phone (310)-825-9550;  fax (310)-206-5658;  email: deleeuw@stat.ucla.edu
homepage: http://gifi.stat.ucla.edu
   
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           No matter where you go, there you are. --- Buckaroo Banzai
                    http://gifi.stat.ucla.edu/sounds/nomatter.au