failure xlc compilation of rootv4.02

While trying to compile the rootv4.02 tarball downloaded today ibm xl c/c++ v6 on macosx 10.3 I obtained the following error :

xlC -O -qpic -qchar=signed -I/usr/X11R6/include -Iinclude -DHAVE_CONFIG -I/sw/include -D_REENTRANT -Wno-long-double -UHAVE_CONFIG -DROOTBUILD -c utils/src/rootc int.cxx -o utils/src/rootcint_tmp.o xlC: 1501-210 command option Wno-long-double contains an incorrect subargument
make: *** [utils/src/rootcint_tmp.o] Error 40

[and for a few other cint related compiles]

Compiling by hand and removing the "-Wno-long-double" allows one to advance, but, then there the biuld/unix/depend which passes within it's options the "-Wno-long-double" which than causes the compilation of rootcint, RStl, rlibmap, InitGui, etc to fail.

Where is the extra flag "-Wno-long-double" defined so I might remove it and see if it all compiles ?

Thanks,

Karl

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