I have been looking into the problem of reading DEM files from tape to disk,
and then processing them through m.dem.extract on a SUN sparc station 2 and
have found that in GRASS 4.0 without Steffen Meyer's fix, the program does
not read the DEM header information correctly. Here is a simpler version of
the fix, modify line 37 of main.c from:
blocksize = sscanf(opt3->answer, "%d", &blocksize) ;
to:
sscanf(opt3->answer, "%d", &blocksize) ;
previously sscanf was returning a value of 1 which was then written into
blocksize thus writing over the correct value.