File.exists? was removed from the stdlib in favor of File.exist?

--- h2o-2.2.6.orig/deps/mruby-onig-regexp/mrbgem.rake
+++ h2o-2.2.6/deps/mruby-onig-regexp/mrbgem.rake
@@ -66,7 +66,7 @@
           end
 
           _pp 'autotools', oniguruma_dir
-          run_command e, './autogen.sh' if File.exists? 'autogen.sh'
+          run_command e, './autogen.sh' if File.exist? 'autogen.sh'
           run_command e, "./configure --disable-shared --enable-static #{host}"
           run_command e, 'make'
         else
@@ -94,7 +94,7 @@
       file libmruby_a => Dir.glob("#{libonig_objs_dir}/*#{objext}")
     end
 
-    file libmruby_a => Dir.glob("#{libonig_objs_dir}/*#{objext}") if File.exists? oniguruma_lib
+    file libmruby_a => Dir.glob("#{libonig_objs_dir}/*#{objext}") if File.exist? oniguruma_lib
 
     file "#{dir}/src/mruby_onig_regexp.c" => oniguruma_lib
     cc.include_paths << oniguruma_dir
--- h2o-2.2.6.orig/deps/mruby/minirake
+++ h2o-2.2.6/deps/mruby/minirake
@@ -261,7 +261,7 @@
         dir = args.is_a?(Hash) ? args.keys.first : args
         (dir.split(File::SEPARATOR) + ['']).inject do |acc, part|
           (acc + File::SEPARATOR).tap do |d|
-            Dir.mkdir(d) unless File.exists? d
+            Dir.mkdir(d) unless File.exist? d
           end + part
         end
       end