[Compass Core] +font-face mixin uses stylesheet_url to form urls relative to the css directory.

lib/compass/frameworks/compass/stylesheets/compass/css3/_font_face.sass

@@ -11,14 +11,14 @@
     @if !style
       font-style= !style
     @if !eot
-      src: url('#{!eot}')
+      src= stylesheet_url(!eot)
     @if !postscript
       src: local('#{!name}'), local('#{!postscript}'), #{!font_files}
     @else
       src: local('#{!name}'), #{!font_files}
 
 // EXAMPLE
-  +font-face("this name", font_files("this.woff", "woff", "this.otf", "opentype"), "fonts/this.eot", "thisname")
+  +font-face("this name", font-files("this.woff", "woff", "this.otf", "opentype"), "fonts/this.eot", "thisname")
   
   will generate:
     

lib/compass/sass_extensions/functions/font_files.rb

@@ -3,7 +3,7 @@ module Compass::SassExtensions::Functions::FontFiles
     raise Sass::SyntaxError, "An even number of arguments must be passed to font_files()" unless args.size % 2 == 0
     files = []
     while args.size > 0
-      files << "url('#{args.shift}') format('#{args.shift}')"
+      files << "#{stylesheet_url(args.shift)} format('#{args.shift}')"
     end
     Sass::Script::String.new(files.join(", "))
   end