diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19fc71865..09fea1e0e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -702,8 +702,13 @@ ELSE(MSVC)
         MESSAGE(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
 ENDIF(MSVC)
 IF(MINGW)
-	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mthreads")
-	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mthreads")
+	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12477
+	# Actually '-Wno-inline-dllimport' should work to suppress warnings of the form:
+	# inline function 'foo' is declared as dllimport: attribute ignored
+	# But it doesn't work with MinGW gcc 4.5.0 while using '-Wno-attributes' seems to
+	# do the trick.
+	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mthreads -Wno-attributes")
+	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mthreads -Wno-attributes")
 	SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -mthreads -Wl,--export-all-symbols")
 	SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -mthreads -Wl,--export-all-symbols")
 	# http://stackoverflow.com/questions/8375310/warning-auto-importing-has-been-activated-without-enable-auto-import-specifie
diff --git a/src/Mod/PartDesign/Gui/Workbench.cpp b/src/Mod/PartDesign/Gui/Workbench.cpp
index c1dcaac3d..7912f968b 100644
--- a/src/Mod/PartDesign/Gui/Workbench.cpp
+++ b/src/Mod/PartDesign/Gui/Workbench.cpp
@@ -191,11 +191,13 @@ Gui::MenuItem* Workbench::setupMenuBar() const
           << "PartDesign_LinearPattern"
           << "PartDesign_PolarPattern"
 //          << "PartDesign_Scaled"
-          << "PartDesign_MultiTransform"
-          << "PartDesign_InvoluteGear";
+          << "PartDesign_MultiTransform";
     // For 0.13 a couple of python packages like numpy, matplotlib and others
     // are not deployed with the installer on Windows. Thus, the WizardShaft is
     // not deployed either hence the check for the existence of the command.
+    if (Gui::Application::Instance->commandManager().getCommandByName("PartDesign_InvoluteGear")) {
+        *part << "PartDesign_InvoluteGear";
+    }
     if (Gui::Application::Instance->commandManager().getCommandByName("PartDesign_WizardShaft")) {
         *part << "Separator" << "PartDesign_WizardShaft";
     }
diff --git a/src/Mod/PartDesign/InitGui.py b/src/Mod/PartDesign/InitGui.py
index 855d3d8a6..05732d188 100644
--- a/src/Mod/PartDesign/InitGui.py
+++ b/src/Mod/PartDesign/InitGui.py
@@ -69,10 +69,13 @@ class PartDesignWorkbench ( Workbench ):
                 try:
                     from WizardShaft import WizardShaft
                 except:
-                    print "Wizard shaft not installed"
+                    print "Wizard shaft module cannot be loaded"
                 import PartDesignGui
                 import PartDesign
-                import InvoluteGearFeature
+                try:
+                    import InvoluteGearFeature
+                except:
+                    print "Involute gear module cannot be loaded"
         def GetClassName(self):
                 return "PartDesignGui::Workbench"