R CMD SHLIB fails under Mac OS (PR#9353)

Full_Name: Hendrik Fu?
Version: 2.4.0
OS: Mac OS 10.4.8
Submission from: (NULL) (201.27.208.230)


R 2.4.0 on Mac OS X cannot seem to build shared libraries using R CMD SHLIB.

R CMD SHLIB mylib.o yields an error message:
/usr/bin/libtool: unknown option character `m' in: -macosx_version_min

I cannot locate the Makefile, so I don't know what's wrong here.

cheers
Hendrik