I've added the -single_module option to the intel-darwin.link.dll
action to fix this linker error when linking dylibs:
ld: common symbols not allowed with MH_DYLIB output format with the -multi_module option
boost/bin.v2/libs/system/build/intel-darwin-9.1/debug/macosx-version-10.4/error_code.o
definition of common ZGVZNK5boost6system14error_category7messageEiE1s (size 16)
boost/bin.v2/libs/system/build/intel-darwin-9.1/debug/macosx-version-10.4/error_code.o
definition of common ZZNK5boost6system14error_category7messageEiE1s (size 16)
though I would note that the common symbols problem occurs in a number of
other libraries (test, graph, spirit, ...) as well.
