commit 6661b7662c96695a6a8e53b62b9490e5dd7f7588
Author: Orion Poplawski <orion@nwra.com>
Date:   Tue Nov 7 20:01:53 2023 -0700

    Allow building with external zfp package

diff --git a/ThirdParty/zfp/CMakeLists.txt b/ThirdParty/zfp/CMakeLists.txt
index 9039e12c65..d55fed6997 100644
--- a/ThirdParty/zfp/CMakeLists.txt
+++ b/ThirdParty/zfp/CMakeLists.txt
@@ -1,15 +1,20 @@
-vtk_module_third_party_internal(
-  LICENSE_FILES
-    "vtkzfp/LICENSE"
-  SPDX_LICENSE_IDENTIFIER
-    "BSD-3-Clause"
-  SPDX_COPYRIGHT_TEXT
-    "Copyright (c) 2014-2019, Lawrence Livermore National Security, LLC."
-  SPDX_DOWNLOAD_LOCATION
-    "git+https://gitlab.kitware.com/third-party/zfp.git@for/vtk-20190605-0.5.5"
-  VERSION
-    "0.5.5"
-  STANDARD_INCLUDE_DIRS)
+vtk_module_third_party(
+  INTERNAL
+    LICENSE_FILES
+      "vtkzfp/LICENSE"
+    SPDX_LICENSE_IDENTIFIER
+      "BSD-3-Clause"
+    SPDX_COPYRIGHT_TEXT
+      "Copyright (c) 2014-2019, Lawrence Livermore National Security, LLC."
+    SPDX_DOWNLOAD_LOCATION
+      "git+https://gitlab.kitware.com/third-party/zfp.git@for/vtk-20190605-0.5.5"
+    VERSION
+      "0.5.5"
+    STANDARD_INCLUDE_DIRS
+  EXTERNAL
+    PACKAGE zfp
+    TARGETS zfp::zfp
+    STANDARD_INCLUDE_DIRS)
 
 configure_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/vtk_zfp.h.in"