Checking if your kit is complete... Looks good Writing Makefile for Math::Macopt cp Macopt.pod blib/lib/Math/Macopt.pod cp Macopt.pm blib/lib/Math/Macopt.pm g++ -ansi -pedantic -O2 -Wall -fPIC -c -o macopt.o macopt.cc g++ -ansi -pedantic -O2 -Wall -fPIC -c -o nrutil.o nrutil.cc g++ -ansi -pedantic -O2 -Wall -fPIC -c -o r.o r.cc g++ -shared macopt.o nrutil.o r.o -o libmacopt.so powerpc-apple-darwin8-g++-4.0.1: unrecognized option '-shared' /usr/bin/ld: Undefined symbols: _main collect2: ld returned 1 exit status make[1]: *** [macopt] Error 1 make: *** [subdirs] Error 2