--- a/suite/config/tooltool-manifests/macosx64/clang.manifest
+++ b/suite/config/tooltool-manifests/macosx64/clang.manifest
@@ -19,16 +19,24 @@
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     "algorithm": "sha512",
     "filename": "cctools.tar.bz2",
     "unpack": true
   },
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+    "size":  30823112,
+    "visibility": "internal",
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+    "algorithm": "sha512",
+    "unpack": true,
+    "filename": "MacOSX10.10.sdk.tar.xz"
+  },
+  {
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--- a/suite/config/tooltool-manifests/macosx64/releng.manifest
+++ b/suite/config/tooltool-manifests/macosx64/releng.manifest
@@ -11,16 +11,24 @@
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     "algorithm": "sha512",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
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+    "algorithm": "sha512",
+    "unpack": true,
+    "filename": "MacOSX10.10.sdk.tar.xz"
+  },
+  {
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