From 98b165db27a3c15b9c0df208d1acca573b3dd15e Mon Sep 17 00:00:00 2001
From: Viktor Hofer <viktor.hofer@microsoft.com>
Date: Tue, 23 Jul 2024 13:35:38 +0200
Subject: [PATCH] Fix source-build leg (#105306)

---
 src/libraries/oob.proj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libraries/oob.proj b/src/libraries/oob.proj
index b94fb00dbd813..21db8f35584f1 100644
--- a/src/libraries/oob.proj
+++ b/src/libraries/oob.proj
@@ -18,7 +18,8 @@
 
   <ItemGroup Condition="'$(BuildTargetFramework)' != '$(NetCoreAppCurrent)' or '$(BuildTargetFramework)' == ''">
     <ProjectReference Include="oob-all.proj" SkipGetTargetFrameworkProperties="true" />
-    <ProjectReference Include="oob-gen.proj" />
+    <!-- Skip building all source generators when building from source as that would bring new prebuilts in. -->
+    <ProjectReference Include="oob-gen.proj" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
   </ItemGroup>
 
   <!-- Support building reference projects only. -->