$ gulp sprite --portal wikipedia.org
[17:37:44] Using gulpfile ~/Documents/wikimedia/developer/wikimedia/portals/gulpfile.js
[17:37:44] Starting 'sprite'...
[17:37:44] 'sprite' errored after 22 ms
[17:37:44] Error: PluggableError: lwip not found.
    at formatError (/usr/lib/node_modules/gulp/bin/gulp.js:169:10)
    at Gulp.<anonymous> (/usr/lib/node_modules/gulp/bin/gulp.js:195:15)
    at emitOne (events.js:96:13)
    at Gulp.emit (events.js:188:7)
    at Gulp.Orchestrator._emitTaskDone (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/index.js:264:8)
    at /home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/index.js:275:23
    at finish (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/lib/runTask.js:21:8)
    at module.exports (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/lib/runTask.js:36:10)
    at Gulp.Orchestrator._runTask (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/index.js:273:3)
    at Gulp.Orchestrator._runStep (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/index.js:214:10)
    at Gulp.Orchestrator.start (/home/urbanecm/Documents/wikimedia/developer/wikimedia/portals/node_modules/orchestrator/index.js:134:8)
    at /usr/lib/node_modules/gulp/bin/gulp.js:129:20
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickCallback (internal/process/next_tick.js:104:9)
    at Module.runMain (module.js:606:11)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:504:3