diff --git a/build/win32/vs10/gtk-install.propsin b/build/win32/vs10/gtk-install.propsin
index 910218c9ee..e992895f70 100644
--- a/build/win32/vs10/gtk-install.propsin
+++ b/build/win32/vs10/gtk-install.propsin
@@ -61,14 +61,14 @@ copy ..\..\..\gtk\gtkrc.default $(CopyDir)\share\themes\Raleigh\gtk-2.0\gtkrc
 
 if exist $(CopyDir)\share\icons\hicolor $(CopyDir)\bin\gtk-update-icon-cache.exe --ignore-theme-index --force "$(CopyDir)\share\icons\hicolor"
 
-mkdir $(CopyDir)\lib\pkgconfig
-copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig
-copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig\gdk-win32-2.0.pc
-copy "..\gtk+-2.0.pc" "$(CopyDir)\lib\pkgconfig"
-copy "..\gtk+-2.0.pc" "$(CopyDir)\lib\pkgconfig\gtk+-win32-2.0.pc"
+if exist ..\gtk+-2.0.pc mkdir $(CopyDir)\lib\pkgconfig
+if exist ..\gdk-2.0.pc copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig
+if exist ..\gdk-2.0.pc copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig\gdk-win32-2.0.pc
+if exist ..\gtk+-2.0.pc copy "..\gtk+-2.0.pc" "$(CopyDir)\lib\pkgconfig"
+if exist ..\gtk+-2.0.pc copy "..\gtk+-2.0.pc" "$(CopyDir)\lib\pkgconfig\gtk+-win32-2.0.pc"
 </GtkDoInstall>
-    <GenerateGtkPC>$(PythonPath)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=i686-pc-vs$(VSVer)</GenerateGtkPC>
-    <GenerateGtkPCX64>$(PythonPathX64)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=x86_64-pc-vs$(VSVer)</GenerateGtkPCX64>
+    <GenerateGtkPC>if exist $(PythonPath)\python.exe $(PythonPath)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=i686-pc-vs$(VSVer)</GenerateGtkPC>
+    <GenerateGtkPCX64>if exist $(PythonPathX64)\python.exe $(PythonPathX64)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=x86_64-pc-vs$(VSVer)</GenerateGtkPCX64>
     <GtkPCFiles>$(SolutionDir)\..\gdk-2.0.pc;$(SolutionDir)\..\gtk+-2.0.pc;$(SolutionDir)\..\gail.pc</GtkPCFiles>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/build/win32/vs9/gtk-install.vspropsin b/build/win32/vs9/gtk-install.vspropsin
index 8da8207939..6544f2b279 100644
--- a/build/win32/vs9/gtk-install.vspropsin
+++ b/build/win32/vs9/gtk-install.vspropsin
@@ -62,19 +62,19 @@ copy ..\..\..\gtk\gtkrc.default $(CopyDir)\share\themes\Raleigh\gtk-$(ApiVersion
 
 if exist $(CopyDir)\share\icons\hicolor $(CopyDir)\bin\gtk-update-icon-cache.exe --ignore-theme-index --force &quot;$(CopyDir)\share\icons\hicolor&quot;&#x0D;&#x0A;
 
-mkdir $(CopyDir)\lib\pkgconfig&#x0D;&#x0A;
-copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig&#x0D;&#x0A;
-copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig\gdk-win32-2.0.pc&#x0D;&#x0A;
-copy &quot;..\gtk+-2.0.pc&quot; &quot;$(CopyDir)\lib\pkgconfig&quot;&#x0D;&#x0A;
-copy &quot;..\gtk+-2.0.pc&quot; &quot;$(CopyDir)\lib\pkgconfig\gtk+-win32-2.0.pc&quot;&#x0D;&#x0A;
+if exist ..\gtk+-2.0.pc mkdir $(CopyDir)\lib\pkgconfig&#x0D;&#x0A;
+if exist ..\gdk-2.0.pc copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig&#x0D;&#x0A;
+if exist ..\gdk-2.0.pc copy ..\gdk-2.0.pc $(CopyDir)\lib\pkgconfig\gdk-win32-2.0.pc&#x0D;&#x0A;
+if exist ..\gtk+-2.0.pc copy &quot;..\gtk+-2.0.pc&quot; &quot;$(CopyDir)\lib\pkgconfig&quot;&#x0D;&#x0A;
+if exist ..\gtk+-2.0.pc copy &quot;..\gtk+-2.0.pc&quot; &quot;$(CopyDir)\lib\pkgconfig\gtk+-win32-2.0.pc&quot;&#x0D;&#x0A;
 		      "
 	/>
 	<UserMacro
 		Name="GenerateGtkPC"
-		Value="$(PythonPath)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=i686-pc-vs$(VSVer)"
+		Value="if exist $(PythonPath)\python.exe $(PythonPath)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=i686-pc-vs$(VSVer)"
 	/>
 	<UserMacro
 		Name="GenerateGtkPCX64"
-		Value="$(PythonPathX64)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=x86_64-pc-vs$(VSVer)"
+		Value="if exist $(PythonPathX64)\python.exe $(PythonPathX64)\python ..\gtkpc.py --prefix=$(CopyDir) --version=$(GtkVersion) --host=x86_64-pc-vs$(VSVer)"
 	/>
 </VisualStudioPropertySheet>