fix issue with UTF-8-MAC paths not matching UTF-8 paths in build clean

middleman-core/lib/middleman-core/cli/build.rb

@@ -159,6 +159,7 @@ module Middleman::Cli
       return unless File.exist?(@build_dir)
 
       paths = ::Middleman::Util.all_files_under(@build_dir).map(&:realpath).select(&:file?)
+
       @to_clean += paths.select do |path|
         path.to_s !~ /\/\./ || path.to_s =~ /\.(htaccess|htpasswd)/
       end
@@ -211,9 +212,15 @@ module Middleman::Cli
         output_path = render_to_file(resource)
 
         if should_clean? && output_path.exist?
+          if RUBY_PLATFORM =~ /darwin/
+            # handle UTF-8-MAC filename on MacOS
+
+            @to_clean.delete(output_path.realpath.to_s.encode('UTF-8', 'UTF-8-MAC'))
+          else
             @to_clean.delete(output_path.realpath)
           end
         end
+      end
 
       ::Middleman::Profiling.report("build")
     end