[Nix-dev] Checksum errors trying to install ghc-6.6.1

[Sean E. Russell]

I'm trying to upgrade a nixos chroot environment, and it is blocking on 
ghc-6.6.1 because of a checksum failure.

[root at bean:/]$ nix-env -u '*'
	<... a bunch of output cut ...>
output path 
`/nix/store/xnrgm2k9ggms430h7fi3mv2kmp2d83qw-ghc-6.6.1-src.tar.bz2' should 
have md5 hash `dea271503463bd28c27f25ab90998633', instead has 
`ba9f4aec2fde5ff1e1548ae69b78aeb0'
cannot build derivation 
`/nix/store/81bcvxhd68zz6ybfbvrh0fbg5qfxb9ic-ghc-6.6.1.drv': 1 inputs could 
not be realised
error: build of `/nix/store/81bcvxhd68zz6ybfbvrh0fbg5qfxb9ic-ghc-6.6.1.drv' 
failed

Is there a way to tell nix-env to ignore the md5 sum check?

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