I wonder why you use mindi 2.0.7.5, as for mondo 2.2.9.7 you need mindi 2.0.7.8.
the tar file on the ftp server is 191338 in size:
$ ll mindi-2.0.7.5.tar.gz
68727 -rw-r--r-- 1 bruno bruno 191338 2011-01-20 00:34 mindi-2.0.7.5.tar.gz
So wget is right. Now, I don't know why gentoo think it should be another size, and I'm not that much a gentoo specialist.
Maybe it's linked to the fact that in my gentoo directory I have:
mindi.ebuild -> mindi-2.0.7.8-r1.ebuild
corresponding to the fact that the latest is indeed not 2.0.7.5 which may create the problem on your side.
HTH.