Hi Fanouris,
I was getting this error when compiling GridFlow 0.8.4 as well.
On Oct 24, 2006, at 8:56 AM, Fanouris Moraitis wrote:
/usr/bin/ld: -undefined error, -undefined dynamic_lookup or -undefined define_a_way must be used when -twolevel_namespace is in effect
The solution was to copy the entire commandline that invokes the compiler, paste into Text Edit or some such and change the instance of "-undefined suppress" to "-undefined error" and copy-paste it back in your Terminal window. That's what worked for me.. Note that it doesn't work to change "-undefined suppress" in the Makefile or Makefile.in because some other components of GridFlow must explicitly require "-undefined suppress". Good luck! P.S. I'm on 10.3.9 so I'm not sure how different the process is but I don't imagine it is very much.
./d5