On May 5, 2008, at 3:33 PM, Ben Abbott wrote: > later I'll try building with -O2 to see if the log2 feature goes away I noticed I was using gcc4.3 for fortran and gcc4.0 or the remainder. I've since built with -O2 using both gcc4.0 and gcc4.3. In each case the log2 failures persist. I'm happy to try out any proposed solutions. Ben