[Nix-dev] Unable to install clang/llvm 3.9

[Wink Saville]

I'm unable to install clang/llvm 3.9.0:

[wink at vps1:~]$ nix-env -qa llvm
warning: name collision in input Nix expressions, skipping
‘/home/wink/.nix-defexpr/channels_root/nixos’
llvm-3.4.2
llvm-3.5.2
llvm-3.6.2
llvm-3.7.1
llvm-3.8.0

[wink at vps1:~]$ nix-env -qa clang
warning: name collision in input Nix expressions, skipping
‘/home/wink/.nix-defexpr/channels_root/nixos’
clang-3.7.1



I'm currently on nixos-unstable-small:

[wink at vps1:~]$ nix-channel --list
nixos https://nixos.org/channels/nixos-unstable-small


What am I doing wrong?

-- Wink