nix-env macvim sha256sum problem

gistfile1.txt

nix-env -i macvim       
installing `macvim-7.4.479'
these derivations will be built:
  /nix/store/0x0v33h6823klxdqm3hhjm6r9srxjj4c-luajit-2.0.3.drv
  /nix/store/0zdy26p9fxfbmvav0j15a3ffy9d2iwmc-macvim-7.4.479.drv
  /nix/store/1vrkqbqrkkmdqs21ydi1l8maws90y561-ruby-1.9.3-p547.drv
  /nix/store/2633v4gbdinqxfhlncjfb9gl5dj8kbqz-libarchive-3.1.2.drv
  /nix/store/27sdqrznrmw15n8b89p0prkaix4szpgs-stdenv.drv
  /nix/store/7mp25ifirn2zgcvjddn0p4j0qla6hlcp-cmake-2.8.12.2.tar.gz.drv
  /nix/store/8masdmqnkddafsrm1vcx54x20bnrbm7r-macvim-f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59-src.drv
  /nix/store/9565cmknw9z9a47a1f370096pms3i8gj-clang-wrapper-wrapper-3.3.drv
  /nix/store/cb8bzhx8zqz3ckqnvpsjcrrhni8wkqpj-llvm-3.3.src.tar.gz.drv
  /nix/store/clj5lpw194kv8xif2h2gv93j1cjxwj58-stdenv.drv
  /nix/store/d39c4rhzjlvwggpxnm53yvy8fddx20kk-ruby-1.9.3-p547.drv
  /nix/store/f9agclpxni6yl47dczmd0bfvvpaqiazm-libarchive-3.1.2.tar.gz.drv
  /nix/store/fh0cxzi6fjhplsk9n0cybg094nd16j1x-cmake-2.8.12.2.drv
  /nix/store/g0f847899v1l7iy2q3ja2zh1r0lz7ja8-cfe-3.3.src.tar.gz.drv
  /nix/store/ibyf4aq6j8b8cq75mnvxknc6d6hmg9hl-clang-wrapper-3.3.drv
  /nix/store/jj7rmgxw88mb92s1md4f46f32ryh7n87-FindFreetype-2.5.patch.drv
  /nix/store/js74b1f0hhfc4b78ahs7gj016yrvh6m7-LuaJIT-2.0.3.tar.gz.drv
  /nix/store/nndnmq5k06kdpmvv98wqdki5dv2h9az7-gcc-apple-wrapper-4.2.1.5666.3.drv
  /nix/store/nv1l1lb2232paw98da2w9jkl7qzvwjrb-ruby-v1_9_3_547-src.drv
  /nix/store/p68ic6hj7wbnpmh1qx2wsfkrm8n142wb-ruby-1.9.3-p547.tar.bz2.drv
  /nix/store/rgmzhwsdjrlnlxdw22060brhg9dm183f-clang-3.3.drv
  /nix/store/wbbv84in90hpx797jwrv9n7wp62y5lp7-llvm-3.3.drv
these paths will be fetched (7.01 MiB download, 50.83 MiB unpacked):
  /nix/store/1xdr7rdh3wvbp8wsgs8sjiklanx0mvqy-sharutils-4.11.1
  /nix/store/6i7lg8cswxl9awisj3v0nrjgshvkyc6w-libffi-3.0.13
  /nix/store/gzwiy78nf2mz1ic61wnc5zsid1jyhlff-gcc-apple-4.2.1.5666.3
  /nix/store/nwwr6zpy7627pbw2n0f77733c803pb2d-patchutils-0.3.3
building path(s) `/nix/store/x074hscic1rx804dfw7wslvwp3ki563g-macvim-f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59-src'

trying https://github.com/genoma/macvim/archive/f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   155    0   155    0     0    218      0 --:--:-- --:--:-- --:--:--   223
100 12.4M  100 12.4M    0     0  1457k      0  0:00:08  0:00:08 --:--:-- 2375k
unpacking source archive /private/var/folders/bh/q33bp93j2js6zv27rds0n1x00000gn/T/nix-build-macvim-f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59-src.drv-0/f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59.tar.gz
output path `/nix/store/x074hscic1rx804dfw7wslvwp3ki563g-macvim-f9c084b97fa9d5cad2448dfd3eff3d9b7f0fac59-src' should have r:sha256 hash `190bngg8m4bwqcia7w24gn7mmqkhk0mavxy81ziwysam1f652ymf', instead has `1f6l39s6cgyzzr9ix729axmc299mpl29abbc7571g4vply17m7nv'
cannot build derivation `/nix/store/0zdy26p9fxfbmvav0j15a3ffy9d2iwmc-macvim-7.4.479.drv': 1 dependencies couldn't be built
error: build of `/nix/store/0zdy26p9fxfbmvav0j15a3ffy9d2iwmc-macvim-7.4.479.drv' failed