I admit it, I find the Rails Asset Pipeline confusing at times (as do seemingly many others judging from Stackoverflow and elsewhere). Successfully adding the Bootstrap 3 glyphicon fonts took some trial-and-error amongst the various solutions I found as many still resulted in not found errors.
While there may be a better way, I found this approach most effective:
config.assets.paths << Rails.root.join('vendor', 'assets', 'fonts')
config.assets.precompile += %w(.svg .eot .woff .ttf)
@font-face { font-family: 'Glyphicons Halflings'; src: font-url('glyphicons-halflings-regular.eot'); src: font-url('glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), font-url('glyphicons-halflings-regular.woff') format('woff'), font-url('glyphicons-halflings-regular.ttf') format('truetype'), font-url('glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg'); }
Thus far, Not Found errors seem to have been eliminated. If there is a better way, please comment.