6 files changed, 18 insertions, 11 deletions
diff --git a/ext/tk/extconf.rb b/ext/tk/extconf.rb
index 26319a3baa..40a4abd882 100644
--- a/ext/tk/extconf.rb
+++ b/ext/tk/extconf.rb
@@ -114,7 +114,7 @@ def is_macosx?
 end
 
 def maybe_64bit?
-  /64|universal/ =~ RUBY_PLATFORM
+  /64|universal|s390x/ =~ RUBY_PLATFORM
 end
 
 def check_tcltk_version(version)
@@ -313,7 +313,9 @@ def find_macosx_framework
   paths.reverse! unless TkLib_Config["ActiveTcl"] # system has higher priority
 
   paths.map{|dir| dir.strip.chomp('/')}.each{|dir|
+    next unless File.exist?(File.join(dir, "Tcl.framework", "Headers"))
     next unless File.directory?(tcldir = File.join(dir, "Tcl.framework"))
+    next unless File.exist?(File.join(dir, "Tk.framework"), "Headers")
     next unless File.directory?(tkdir  = File.join(dir, "Tk.framework"))
     TkLib_Config["tcltk-framework"] = dir
     return [tcldir, tkdir]
diff --git a/ext/tk/lib/tk/canvas.rb b/ext/tk/lib/tk/canvas.rb
index 7d3d71675c..af404213e7 100644
--- a/ext/tk/lib/tk/canvas.rb
+++ b/ext/tk/lib/tk/canvas.rb
@@ -85,11 +85,16 @@ class Tk::Canvas<TkWindow
 
   # create a canvas item without creating a TkcItem object
   def create(type, *args)
-    type = TkcItem.type2class(type.to_s) unless type.kind_of?(TkcItem)
+    if type.kind_of?(Class) && type < TkcItem
+      # do nothing
+    elsif TkcItem.type2class(type.to_s)
+      type = TkcItem.type2class(type.to_s)
+    else
+      fail ArgumentError, "type must a subclass of TkcItem class, or a string in CItemTypeToClass"
+    end
     type.create(self, *args)
   end
 
-
   def addtag(tag, mode, *args)
     mode = mode.to_s
     if args[0] && mode =~ /^(above|below|with(tag)?)$/
diff --git a/ext/tk/sample/demos-en/tree.rb b/ext/tk/sample/demos-en/tree.rb
index cd62ba8c9b..69154ee076 100644
--- a/ext/tk/sample/demos-en/tree.rb
+++ b/ext/tk/sample/demos-en/tree.rb
@@ -67,7 +67,7 @@ def populate_tree(tree, node)
   path = tree.get(node, :fullpath)
   tree.delete(tree.children(node))
   Dir.glob("#{path}/*").sort.each{|f|
-    type = File.ftype(f)
+    type = File.ftype(f) rescue nil
     id = tree.insert(node, :end,
                      :text=>File.basename(f), :values=>[f, type]).id
     if type == 'directory'
diff --git a/ext/tk/sample/demos-en/widget b/ext/tk/sample/demos-en/widget
index 21dd41685f..fb49a746b9 100644
--- a/ext/tk/sample/demos-en/widget
+++ b/ext/tk/sample/demos-en/widget
@@ -683,7 +683,7 @@ def eval_samplecode(code, file=nil)
       end
     }
   }
-  Tk.update
+  Tk.update rescue nil
 end
 
 # invoke --
@@ -699,7 +699,7 @@ def invoke(txt, idx)
 
   cursor = txt.cget('cursor')
   txt.cursor('watch')
-  Tk.update
+  Tk.update rescue nil
   # eval(IO.readlines("#{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb").join, _null_binding)
   # Tk.update
   eval_samplecode(IO.readlines("#{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb").join, tag[5..-1] + '.rb')
@@ -1058,7 +1058,7 @@ if ARGV[0] == '-n'
   no_launcher = true if ARGV.size > 0
 else
   # show the root widget to make it lower then demo windows
-  Tk.update
+  Tk.update rescue nil
 end
 ARGV.each{|cmd|
   if cmd =~ /(.*).rb/
diff --git a/ext/tk/sample/demos-jp/tree.rb b/ext/tk/sample/demos-jp/tree.rb
index 1c779391d4..3f3b18b677 100644
--- a/ext/tk/sample/demos-jp/tree.rb
+++ b/ext/tk/sample/demos-jp/tree.rb
@@ -68,7 +68,7 @@ def populate_tree(tree, node)
   path = tree.get(node, :fullpath)
   tree.delete(tree.children(node))
   Dir.glob("#{path}/*").sort.each{|f|
-    type = File.ftype(f)
+    type = File.ftype(f) rescue nil
     id = tree.insert(node, :end,
                      :text=>File.basename(f), :values=>[f, type]).id
     if type == 'directory'
diff --git a/ext/tk/sample/demos-jp/widget b/ext/tk/sample/demos-jp/widget
index 193c15affd..5f5dfb9d70 100644
--- a/ext/tk/sample/demos-jp/widget
+++ b/ext/tk/sample/demos-jp/widget
@@ -740,7 +740,7 @@ def eval_samplecode(code, file=nil)
       end
     }
   }
-  Tk.update
+  Tk.update rescue nil
 end
 
 # テキスト上での click に対する動作
@@ -750,7 +750,7 @@ def invoke(txt, idx)
 
   cursor = txt.cget('cursor')
   txt.cursor('watch')
-  Tk.update
+  Tk.update rescue nil
   # eval(IO.readlines("#{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb").join, _null_binding)
   # Tk.update
   eval_samplecode(IO.readlines("#{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb").join, tag[5..-1] + '.rb')
@@ -1094,7 +1094,7 @@ if ARGV[0] == '-n'
   no_launcher = true if ARGV.size > 0
 else
   # show the root widget to make it lower then demo windows
-  Tk.update
+  Tk.update rescue nil
 end
 ARGV.each{|cmd|
   if cmd =~ /(.*).rb/