diff --git a/macbuild/build4mac.py b/macbuild/build4mac.py
index 1bb775bea..f43ce7c15 100755
--- a/macbuild/build4mac.py
+++ b/macbuild/build4mac.py
@@ -61,9 +61,10 @@ def SetGlobals():
   Usage += "                        : * key type names below are case insensitive *   | \n"
   Usage += "                        :   'nil' = not to support the script language    | \n"
   Usage += "                        :   'Sys' = using the OS standard script language | \n"
+  Usage += "                        : Refer to 'macbuild/build4mac_env.py' for details| \n"
   Usage += "   [-q|--qt <type>]     : type=['Qt4MacPorts', 'Qt5MacPorts']             | qt5macports \n"
-  Usage += "   [-r|--ruby <type>]   : type=['nil', 'Sys', 'RubySource']               | sys \n"
-  Usage += "   [-p|--python <type>] : type=['nil', 'Sys', 'Anaconda27', 'Anaconda36'] | sys \n"
+  Usage += "   [-r|--ruby <type>]   : type=['nil', 'Sys', 'Src24', 'MP24']            | sys \n"
+  Usage += "   [-p|--python <type>] : type=['nil', 'Sys', 'Ana27', 'Ana36', 'MP36']   | sys \n"
   Usage += "   [-n|--noqtbinding]   : don't create Qt bindings for ruby scripts       | disabled \n"
   Usage += "   [-m|--make <option>] : option passed to 'make'                         | -j4 \n"
   Usage += "   [-d|--debug]         : enable debug mode build                         | disabled \n"
@@ -155,11 +156,11 @@ def ParseCommandLineArguments():
 
   p.add_option( '-r', '--ruby',
                 dest='type_ruby',
-                help="Ruby type=['nil', 'Sys', 'RubySource']" )
+                help="Ruby type=['nil', 'Sys', 'Src24', 'MP24']" )
 
   p.add_option( '-p', '--python',
                 dest='type_python',
-                help="Python type=['nil', 'Sys', 'Anaconda27', 'Anaconda36']" )
+                help="Python type=['nil', 'Sys', 'Ana27', 'Ana36', 'MP36']" )
 
   p.add_option( '-n', '--noqtbinding',
                 action='store_true',
@@ -231,7 +232,7 @@ def ParseCommandLineArguments():
     quit()
 
   # Determine Ruby type
-  candidates = [ i.upper() for i in ['nil', 'Sys', 'RubySource'] ]
+  candidates = [ i.upper() for i in ['nil', 'Sys', 'Src24', 'MP24'] ]
   ModuleRuby = ""
   index      = 0
   for item in candidates:
@@ -253,6 +254,8 @@ def ParseCommandLineArguments():
         break
       elif index == 2:
         ModuleRuby = 'Ruby24SrcBuild'
+      elif index == 3:
+        ModuleRuby = 'Ruby24MacPorts'
     else:
       index += 1
   if ModuleRuby == "":
@@ -262,9 +265,9 @@ def ParseCommandLineArguments():
     quit()
 
   # Determine Python type
-  candidates = [ i.upper() for i in ['nil', 'Sys', 'Anaconda27', 'Anaconda36'] ]
+  candidates   = [ i.upper() for i in ['nil', 'Sys', 'Ana27', 'Ana36', 'MP36'] ]
   ModulePython = ""
-  index      = 0
+  index        = 0
   for item in candidates:
     if opt.type_python.upper() == item:
       if index == 0:
@@ -286,6 +289,8 @@ def ParseCommandLineArguments():
         ModulePython = 'Anaconda27'
       elif index == 3:
         ModulePython = 'Anaconda36'
+      elif index == 4:
+        ModulePython = 'Python36MacPorts'
     else:
       index += 1
   if ModulePython == "":
@@ -488,7 +493,7 @@ def DeployBinariesForBundle():
 
 
   print( " [3] Creating the standard directory structure for 'klayout.app' bundle ..." )
-  #-------------------------------------------------------------
+  #-----------------------------------------------------------------
   # [3] Create the directory skeleton for "klayout.app" bundle
   #     and command line buddy tools such as "strm2cif".
   #     They are stored in the directory structure below.
@@ -497,8 +502,11 @@ def DeployBinariesForBundle():
   #                +-- Contents/+
   #                             +-- Info.plist
   #                             +-- PkgInfo
-  #                             +-- Resources/
-  #                             +-- Frameworks/
+  #                             +-- Resources/+
+  #                             |             +-- 'klayout.icns'
+  #                             +-- Frameworks/+
+  #                             |              +-- '*.framework'
+  #                             |              +-- '*.dylib'
   #                             +-- MacOS/+
   #                             |         +-- 'klayout'
   #                             +-- Buddy/+
@@ -506,7 +514,7 @@ def DeployBinariesForBundle():
   #                                       +-- 'strm2dxf'
   #                                       :
   #                                       +-- 'strmxor'
-  #-------------------------------------------------------------
+  #-----------------------------------------------------------------
   targetDir0 = "%s/klayout.app/Contents" % AbsMacPkgDir
   targetDirR = targetDir0 + "/Resources"
   targetDirF = targetDir0 + "/Frameworks"
@@ -715,23 +723,25 @@ def DeployScriptBundles():
 
 
   print( " [3] Creating the standard directory structure for the script bundles ..." )
-  #-------------------------------------------------------------
+  #--------------------------------------------------------------------------------------------
   # [3] Create the directory skeleton for the two script bundles.
   #
   #  klayout.scripts/+
   #                  +-- KLayoutEditor.app/+
   #                  |                     +-- Contents/+
   #                  |                                  +-- Info.plist
-  #                  |                                  +-- Resources/
+  #                  |                                  +-- Resources/+
+  #                  |                                  |             +-- 'klayout-red.icns'
   #                  |                                  +-- MacOS/+
   #                  |                                            +-- 'KLayoutEditor.sh'
   #                  +-- KLayoutViewer.app/+
   #                                        +-- Contents/+
   #                                                     +-- Info.plist
-  #                                                     +-- Resources/
+  #                                                     +-- Resources/+
+  #                                                     |             +-- 'klayout-blue.icns'
   #                                                     +-- MacOS/+
   #                                                               +-- 'KLayoutViewer.sh'
-  #-------------------------------------------------------------
+  #--------------------------------------------------------------------------------------------
   os.chdir(ProjectDir)
   targetDir0E = "%s/%s/KLayoutEditor.app/Contents" % ( AbsMacPkgDir, scriptDir )
   targetDir0V = "%s/%s/KLayoutViewer.app/Contents" % ( AbsMacPkgDir, scriptDir )
diff --git a/macbuild/build4mac_env.py b/macbuild/build4mac_env.py
index 525784145..3f85594ff 100755
--- a/macbuild/build4mac_env.py
+++ b/macbuild/build4mac_env.py
@@ -27,6 +27,7 @@ Qts = [ 'Qt4MacPorts', 'Qt5MacPorts' ]
 # Whereabout of different components of Qt4
 #-----------------------------------------------------
 # Qt4 from MacPorts (https://www.macports.org/)
+# [Key Type Name] = 'Qt4MacPorts'
 Qt4MacPorts = { 'qmake' : '/opt/local/libexec/qt4/bin/qmake',
                 'deploy': '/opt/local/libexec/qt4/bin/macdeployqt'
               }
@@ -35,6 +36,7 @@ Qt4MacPorts = { 'qmake' : '/opt/local/libexec/qt4/bin/qmake',
 # Whereabout of different components of Qt5
 #-----------------------------------------------------
 # Qt5 from MacPorts (https://www.macports.org/)
+# [Key Type Name] = 'Qt5MacPorts'
 Qt5MacPorts = { 'qmake' : '/opt/local/libexec/qt5/bin/qmake',
                 'deploy': '/opt/local/libexec/qt5/bin/macdeployqt'
               }
@@ -43,30 +45,34 @@ Qt5MacPorts = { 'qmake' : '/opt/local/libexec/qt5/bin/qmake',
 # [2] Ruby
 #-----------------------------------------------------
 Rubies  = [ 'nil', 'RubyYosemite', 'RubyElCapitan', 'RubySierra', 'RubyHighSierra' ]
-Rubies += [ 'Ruby24SrcBuild' ]
+Rubies += [ 'Ruby24SrcBuild', 'Ruby24MacPorts' ]
 
 #-----------------------------------------------------
 # Whereabout of different components of Ruby
 #-----------------------------------------------------
 # Bundled with Yosemite (10.10)
+# [Key Type Name] = 'Sys'
 RubyYosemite    = { 'exe': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby' ,
                     'inc': '/System/Library/Frameworks/Ruby.framework/Headers',
                     'lib': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/libruby.dylib'
                   }
 
 # Bundled with El Capitan (10.11)
+# [Key Type Name] = 'Sys'
 RubyElCapitan   = { 'exe': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby' ,
                     'inc': '/System/Library/Frameworks/Ruby.framework/Headers',
                     'lib': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/libruby.dylib'
                   }
 
 # Bundled with Sierra (10.12)
+# [Key Type Name] = 'Sys'
 RubySierra      = { 'exe': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby' ,
                     'inc': '/System/Library/Frameworks/Ruby.framework/Headers',
                     'lib': '/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/libruby.dylib'
                   }
 
 # Bundled with High Sierra (10.13)
+# [Key Type Name] = 'Sys'
 RubyHighSierra  = { 'exe': '/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby' ,
                     'inc': '/System/Library/Frameworks/Ruby.framework/Headers',
                     'lib': '/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/libruby.dylib'
@@ -74,49 +80,62 @@ RubyHighSierra  = { 'exe': '/System/Library/Frameworks/Ruby.framework/Versions/2
 
 # Ruby 2.4 built from source code (https://github.com/ruby): *+*+*+ EXPERIMENTAL *+*+*+
 #   configured by:
-#       $ ./configure --prefix=$HOME/Ruby24/ --enable-shared
-Ruby24SrcBuild  = { 'exe': '$HOME/Ruby24/bin/ruby',
+#       $ ./configure --prefix=$HOME/Ruby24/ --enable-shared --program-suffix=2.4
+# [Key Type Name] = 'Src24'
+Ruby24SrcBuild  = { 'exe': '$HOME/Ruby24/bin/ruby2.4',
                     'inc': '$HOME/Ruby24/include/ruby-2.4.0',
                     'lib': '$HOME/Ruby24/lib/libruby.2.4.dylib'
                   }
 
+# Ruby 2.4 from MacPorts (https://www.macports.org/) *+*+*+ EXPERIMENTAL *+*+*+
+# [Key Type Name] = 'MP24'
+Ruby24MacPorts  = { 'exe': '/opt/local/bin/ruby2.4',
+                    'inc': '/opt/local/include/ruby-2.4.0',
+                    'lib': '/opt/local/lib/libruby.2.4.dylib'
+                  }
+
 # Consolidated dictionary kit for Ruby
 RubyDictionary  = { 'nil'           : None,
                     'RubyYosemite'  : RubyYosemite,
                     'RubyElCapitan' : RubyElCapitan,
                     'RubySierra'    : RubySierra,
                     'RubyHighSierra': RubyHighSierra,
-                    'Ruby24SrcBuild': Ruby24SrcBuild
+                    'Ruby24SrcBuild': Ruby24SrcBuild,
+                    'Ruby24MacPorts': Ruby24MacPorts
                   }
 
 #-----------------------------------------------------
 # [3] Python
 #-----------------------------------------------------
 Pythons  = [ 'nil', 'PythonYosemite', 'PythonElCapitan', 'PythonSierra', 'PythonHighSierra' ]
-Pythons += [ 'Anaconda27', 'Anaconda36' ]
+Pythons += [ 'Anaconda27', 'Anaconda36', 'Python36MacPorts' ]
 
 #-----------------------------------------------------
 # Whereabout of different components of Python
 #-----------------------------------------------------
 # Bundled with Yosemite (10.10)
+# [Key Type Name] = 'Sys'
 PythonYosemite  = { 'exe': '/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python' ,
                     'inc': '/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7',
                     'lib': '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib'
                   }
 
 # Bundled with El Capitan (10.11)
+# [Key Type Name] = 'Sys'
 PythonElCapitan = { 'exe': '/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python' ,
                     'inc': '/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7',
                     'lib': '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib'
                   }
 
 # Bundled with Sierra (10.12)
+# [Key Type Name] = 'Sys'
 PythonSierra    = { 'exe': '/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python' ,
                     'inc': '/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7',
                     'lib': '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib'
                   }
 
 # Bundled with High Sierra (10.13)
+# [Key Type Name] = 'Sys'
 PythonHighSierra= { 'exe': '/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python' ,
                     'inc': '/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7',
                     'lib': '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib'
@@ -127,6 +146,7 @@ PythonHighSierra= { 'exe': '/System/Library/Frameworks/Python.framework/Versions
 #   and your Python environment was prepared by: $ conda create -n py27klayout python=2.7
 #
 #   No additional modules are added in the beginning.
+# [Key Type Name] = 'Ana27'
 Anaconda27      = { 'exe': '$HOME/anaconda/envs/py27klayout/bin/python2.7' ,
                     'inc': '$HOME/anaconda/envs/py27klayout/include/python2.7',
                     'lib': '$HOME/anaconda/envs/py27klayout/lib/libpython2.7.dylib'
@@ -137,11 +157,19 @@ Anaconda27      = { 'exe': '$HOME/anaconda/envs/py27klayout/bin/python2.7' ,
 #   and your Python environment was prepared by: $ conda create -n py36klayout python=3.6
 #
 #   No additional modules are added in the beginning.
+# [Key Type Name] = 'Ana36'
 Anaconda36      = { 'exe': '$HOME/anaconda/envs/py36klayout/bin/python3.6' ,
                     'inc': '$HOME/anaconda/envs/py36klayout/include/python3.6m',
                     'lib': '$HOME/anaconda/envs/py36klayout/lib/libpython3.6m.dylib'
                   }
 
+# Python 3.6 from MacPorts (https://www.macports.org/) *+*+*+ EXPERIMENTAL *+*+*+
+# [Key Type Name] = 'MP36'
+Python36MacPorts= { 'exe': '/opt/local/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6m' ,
+                    'inc': '/opt/local/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m',
+                    'lib': '/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/libpython3.6m.dylib'
+                  }
+
 # Consolidated dictionary kit for Python
 PythonDictionary= { 'nil'             : None,
                     'PythonYosemite'  : PythonYosemite,
@@ -149,7 +177,8 @@ PythonDictionary= { 'nil'             : None,
                     'PythonSierra'    : PythonSierra,
                     'PythonHighSierra': PythonHighSierra,
                     'Anaconda27'      : Anaconda27,
-                    'Anaconda36'      : Anaconda36
+                    'Anaconda36'      : Anaconda36,
+                    'Python36MacPorts': Python36MacPorts
                   }
 
 #-----------------------------------------------------
diff --git a/macbuild/build4mac_util.py b/macbuild/build4mac_util.py
index a6fe8bbbc..bf704c390 100755
--- a/macbuild/build4mac_util.py
+++ b/macbuild/build4mac_util.py
@@ -121,8 +121,11 @@ def SetChangeIdentificationNameOfDyLib( libdic ):
 #                +-- Contents/+
 #                             +-- Info.plist
 #                             +-- PkgInfo
-#                             +-- Resources/
-#                             +-- Frameworks/
+#                             +-- Resources/+
+#                             |             +-- 'klayout.icns'
+#                             +-- Frameworks/+
+#                             |              +-- '*.framework'
+#                             |              +-- '*.dylib'
 #                             +-- MacOS/+
 #                             |         +-- 'klayout'
 #                             +-- Buddy/+