graphics/ImageMagick seemingly not using OpenMP

[Kirk Strauser]

On my FreeBSD 7.2-STABLE system (from July 29), I'm trying to enable
OpenMP for the graphics/ImageMagick port.  With the IMAGEMAGICK_OPENMP
option set, I get this from "make configure":

checking for cc -std=gnu99 option to support OpenMP... (cached) unsupported
checking for cc -std=gnu99 option to support OpenMP... -fopenmp

If I go on to build it, there's no other mention of OpenMP in the 
output.  What am I doing wrong?
-- 
Kirk Strauser