_FILE_OFFSET_BITS & _LARGE_FILES

[Vittorio]

I'm trying to port ntfs-3g but my first problem is with configure 
because the process stops after this diagnostics:
........................................................................
checking dynamic linker characteristics... freebsd6.1 ld.so
checking 
how to hardcode library paths into programs... immediate
checking 
whether stripping libraries is possible... yes
checking for special C 
compiler options needed for large files... no
checking for 
_FILE_OFFSET_BITS value needed for large files... no
checking for 
_LARGE_FILES value needed for large files... no
configure: error: ntfs-
3g can be built only under Linux.
..................

What should I do?

Vittorio