As reported on c.l.py, the _elementtree project
should depend on the pythoncore project.
diff --git a/PCbuild/pcbuild.sln b/PCbuild/pcbuild.sln
index 7dbdcce..d75e7fb 100644
--- a/PCbuild/pcbuild.sln
+++ b/PCbuild/pcbuild.sln
@@ -81,6 +81,7 @@
 EndProject

 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "_elementtree", "_elementtree.vcproj", "{1966DDE2-4AB7-4E4E-ACC9-C121E4D37F8E}"

 	ProjectSection(ProjectDependencies) = postProject

+		{CF7AC3D1-E2DF-41D2-BEA6-1E2556CDEA26} = {CF7AC3D1-E2DF-41D2-BEA6-1E2556CDEA26}

 	EndProjectSection

 EndProject

 Global