GUI fails to build

[sgehrman]

Tried npm install on the gui and got some errors...
In file included from ../node_modules/nan/nan.h:194:0,
from ../src/ed25519.cc:4:
../node_modules/nan/nan_maybe_43_inl.h: In function ‘Nan::Maybe Nan::ForceSet(v8::Localv8::Object, v8::Localv8::Value, v8::Localv8::Value, v8::PropertyAttribute)’:
../node_modules/nan/nan_maybe_43_inl.h:88:15: error: ‘class v8::Object’ has no member named ‘ForceSet’
return obj->ForceSet(GetCurrentContext(), key, value, attribs);
^~~~~~~~
../node_modules/nan/nan_maybe_43_inl.h: In function ‘Nan::MaybeLocalv8::Object Nan::CloneElementAt(v8::Localv8::Array, uint32_t)’:
../node_modules/nan/nan_maybe_43_inl.h:220:17: error: ‘class v8::Array’ has no member named ‘CloneElementAt’
return array->CloneElementAt(GetCurrentContext(), index);

I updated the packages:

steve@tr4:~/go/src/github/bridge-server/gui$ ncu -a
Using /home/steve/go/src/github/bridge-server/gui/package.json
[..................] \ :
axios ^0.15.3 → ^0.18.0
babel-loader ^6.3.2 → ^8.0.5
bignumber.js ^3.0.1 → ^8.0.2
file-loader ^0.9.0 → ^3.0.1
gulp ^3.9.1 → ^4.0.0
react ^15.4.1 → ^16.7.0
react-d3-components ^0.6.5 → ^0.9.1
react-dom ^15.4.1 → ^16.7.0
stellar-sdk ^0.6.2 → ^0.12.0
webpack ^1.13.3 → ^4.29.0

npm install now succeeds, but building still fails.

steve@tr4:~/go/src/github/bridge-server/gui$ gulp build
[21:03:22] Requiring external module @babel/register

Needs some attention.