Bugzilla Bug 101719

The filesize and MD5 sum for grass-6.0.0.tar.gz in the grass-6.0.0-r2 digest do
not match those of the downloaded file (for all mirrors, including the
authoritative site http://grass.itc.it)

The digest entry in the portage tree is:

   MD5 acfa05ada219cd15c9db1a5d5320e008 grass-6.0.0.tar.gz 7791409

But the values for downloaded file are:

   MD5 42ecbb76b00117a324017e2b27c4fe68 grass-6.0.0.tar.gz 7905863

Hmm, I just deleted my grass tarball, cleaned out the overlay, and tried to 
emerge grass again:

emerge grass -v
Calculating dependencies ...done!
>>> emerge (1 of 1) sci-geosciences/grass-6.0.0-r2 to /
>>> md5 files   ;-) grass-5.0.2.ebuild
>>> md5 files   ;-) grass-5.0.3.ebuild
>>> md5 files   ;-) grass-6.0.0-r2.ebuild
>>> md5 files   ;-) files/digest-grass-5.0.2
>>> md5 files   ;-) files/digest-grass-5.0.3
>>> md5 files   ;-) files/99grass-6
>>> md5 files   ;-) files/digest-grass-6.0.0-r2
>>> md5 src_uri ;-) grass-6.0.0.tar.gz
>>> Unpacking source...
>>> Unpacking grass-6.0.0.tar.gz to /var/tmp/portage/grass-6.0.0-r2/work
 * Applying grass-readline.patch ...                                  [ ok ]

I'll take a closer look tomorrow.

The md5sum for the file I downloaded matches the md5sum from the GRASS website:
   http://www.grass.itc.it/grass60/source/grass-6.0.0.md5sum

Could you be picking up an older/incomplete copy of the tarball from a proxy cache?

Go figure...  Now fixed in CVS.