Issue #15102: Use HOST_PYTHON only if it is set.
diff --git a/PCbuild/x64.props b/PCbuild/x64.props
index 5f26e68..4fb319b 100644
--- a/PCbuild/x64.props
+++ b/PCbuild/x64.props
@@ -1,6 +1,6 @@
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
- <PropertyGroup Label="UserMacros">
+ <PropertyGroup Label="UserMacros" Condition="'$(HOST_PYTHON)'!=''">
<PythonExe>$(HOST_PYTHON)</PythonExe>
</PropertyGroup>
<PropertyGroup>
@@ -23,4 +23,4 @@
<Value>$(PythonExe)</Value>
</BuildMacro>
</ItemGroup>
-</Project>
\ No newline at end of file
+</Project>