I was trying to build an average subject using 250 subjects and I got the following error message:

processing subject nor76 (246 of 250)
reading spherical surface /DATA_FREESURFER/Data/nor76/surf/rh.sphere.reg...
reading colortable from annotation file...
colortable with 35 entries read (originally /space/amaebi/26/users/buckner_cortical_atlas/scripts/colortable_final.txt)
curvature mean = -0.017, std = 0.597
curvature mean = -0.064, std = 0.640
ripping medial wall...
computing parameterization for surface /DATA_FREESURFER/Data/nor76/surf/rh.inflated.H...
ImageAlloc: could not allocate 512x256 buffer

curvature mean = -0.088, std = 0.872
Cannot allocate memory

I saw someone discussing this issue a few month ago and Doug provided new scripts of make_average_subject, make_average_volume and make_average_surface to solve this problem. However, I can't find these files using the link ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

Can anyone tell me whether and how this problem has been solved? Thanks in advance!