/Applications/Xcode.app/Contents/Developer/usr/bin/make all PERL_CORE=1 LIBPERL_A=libperl.a LINKTYPE=dynamic
rm -f ../../lib/auto/B/B.bundle
env MACOSX_DEPLOYMENT_TARGET=10.3 cc -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector B.o -o ../../lib/auto/B/B.bundle
...
ld: library not found for -lgcc_s.10.4
clang: error: linker command failed with exit code 1 (use -v to see invocation)