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I Point to where I have nixpkgs cloned

`export NIXPKGS=~/oss/nixpkgs

I run

nix-build $NIXPKGS -A vimPlugins.deoplete-tabnine --option build-use-sandbox true

and have tried adding nix.useSandbox = true; to my darwin-configuration.nix and ran: nix-build $NIXPKGS -A vimPlugins.deoplete-tabnine --option build-use-sandbox true

I get

these derivations will be built:
  /nix/store/zsydlm3byfwmxcdf39msn42hrbxsacwl-vimplugin-deoplete-tabnine-2019-01-14.drv
building '/nix/store/zsydlm3byfwmxcdf39msn42hrbxsacwl-vimplugin-deoplete-tabnine-2019-01-14.drv'...
unpacking sources
unpacking source archive /nix/store/c77s4s8qaj2jj7cqzlk75yqfv7n9jggw-source
source root is source
patching sources
configuring
building
patching script interpreter paths in .
./install.sh: interpreter directive changed from "/bin/bash -e" to "/nix/store/yy537kls2vdkf1c7x2m06v4dckwyh0gs-bash-4.4-p23/bin/bash -e"
Downloading version 1.0.10
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 8174k  100 8174k    0     0  2562k      0  0:00:03  0:00:03 --:--:-- 2562k
installing
No docs available
post-installation fixup
strip is /nix/store/s33984hx2gwcg2d4dgpcm4342md19qvh-cctools-binutils-darwin/bin/strip
patching script interpreter paths in /nix/store/zyml0vi505sjh7r3azzf6zvys3b03l8r-vimplugin-deoplete-tabnine-2019-01-14
/nix/store/zyml0vi505sjh7r3azzf6zvys3b03l8r-vimplugin-deoplete-tabnine-2019-01-14