npm install fails on os x

[rojomisin]

npm install ravencore-node -g

...
5937 silly preinstall mime-types@2.1.22
5938 info lifecycle mime-types@2.1.22~preinstall: mime-types@2.1.22
5939 timing action:preinstall Completed in 24ms
5940 verbose unlock done using /Users/rmicone/.npm/_locks/staging-3a08f0df5026584d.lock for /usr/local/lib/node_modules/.staging
5941 timing stage:rollbackFailedOptional Completed in 357ms
5942 timing stage:runTopLevelLifecycles Completed in 7365ms
5943 verbose stack Error: ravencore-node@1.0.3 preinstall: `./scripts/download`
5943 verbose stack Exit status 126
5943 verbose stack     at EventEmitter.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:301:16)
5943 verbose stack     at EventEmitter.emit (events.js:197:13)
5943 verbose stack     at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
5943 verbose stack     at ChildProcess.emit (events.js:197:13)
5943 verbose stack     at maybeClose (internal/child_process.js:984:16)
5943 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:265:5)
5944 verbose pkgid ravencore-node@1.0.3
5945 verbose cwd /Users/rmicone/tmp
5946 verbose Darwin 18.2.0
5947 verbose argv "/usr/local/Cellar/node/11.10.1/bin/node" "/usr/local/bin/npm" "install" "-g" "ravencore-node"
5948 verbose node v11.10.1
5949 verbose npm  v6.7.0
5950 error code ELIFECYCLE
5951 error errno 126
5952 error ravencore-node@1.0.3 preinstall: `./scripts/download`
5952 error Exit status 126
5953 error Failed at the ravencore-node@1.0.3 preinstall script.
5953 error This is probably not a problem with npm. There is likely additional logging output above.
5954 verbose exit [ 126, true ]