bin/asciidoctor-epub3 in asciidoctor-epub3-1.5.0.alpha.5 vs bin/asciidoctor-epub3 in asciidoctor-epub3-1.5.0.alpha.6

@@ -1,7 +1,11 @@
 #!/usr/bin/env ruby
 
-require_relative '../lib/asciidoctor-epub3'
+if File.exist?(asciidoctor_epub3 = (File.expand_path '../../lib/asciidoctor-epub3', __FILE__))
+  require asciidoctor_epub3
+else
+  require 'asciidoctor-epub3'
+end
 require 'asciidoctor/cli'
 
 options = Asciidoctor::Cli::Options.new backend: 'epub3'
 
 # FIXME provide an API in Asciidoctor for sub-components to print version information