[Inkscape-devel] Build error on powerpc-apple-darwin7.8.0

I have the following problem building inkscape on the above platform:

object-edit.cpp: In function `void sp_spiral_outer_set(SPItem*, const NR::Point&, const NR::Point&, unsigned int)': object-edit.cpp:842: error: `isfinite' undeclared in namespace `std'

Should this be a configure option?