From c1aa7028963185669305f1a06d7e2fb39fb2bd6d Mon Sep 17 00:00:00 2001
From: Andrej730 <azhilenkov@gmail.com>
Date: Thu, 20 Nov 2025 16:33:20 +0500
Subject: [PATCH] FindHDF5 - describe used variables, initialize from env

---
 cmake/CMakeLists.txt |  3 ---
 cmake/FindHDF5.cmake | 18 ++++++++++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 10760ae835..1227d3c3f0 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -209,9 +209,6 @@ if(NOT MINIMAL_BUILD)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_INCLUDE_DIR)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_LIBRARY)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_EXECUTABLE)
-    UNIFY_ENVVARS_AND_CACHE(HDF5_INCLUDE_DIR)
-    UNIFY_ENVVARS_AND_CACHE(HDF5_LIBRARY_DIR)
-    UNIFY_ENVVARS_AND_CACHE(HDF5_LIBRARIES)
     UNIFY_ENVVARS_AND_CACHE(CGAL_INCLUDE_DIR)
     UNIFY_ENVVARS_AND_CACHE(CGAL_LIBRARY_DIR)
     UNIFY_ENVVARS_AND_CACHE(GMP_INCLUDE_DIR)
diff --git a/cmake/FindHDF5.cmake b/cmake/FindHDF5.cmake
index 3be63d7239..c29c3e6321 100644
--- a/cmake/FindHDF5.cmake
+++ b/cmake/FindHDF5.cmake
@@ -1,3 +1,21 @@
+#
+# Input variables:
+# - `HDF5_INCLUDE_DIR`
+# - `HDF5_LIBRARY_DIR`
+# - `HDF5_LIBRARIES`
+# If input variables are not specified, try to find HDF5 config.
+# Input variables could also be provided as environment variables.
+#
+# Output variables:
+# - `HDF5_INCLUDE_DIR`
+# - `HDF5_LIBRARY_DIR`
+# - `HDF5_LIBRARIES`
+#
+
+UNIFY_ENVVARS_AND_CACHE(HDF5_INCLUDE_DIR)
+UNIFY_ENVVARS_AND_CACHE(HDF5_LIBRARY_DIR)
+UNIFY_ENVVARS_AND_CACHE(HDF5_LIBRARIES)
+
 # To avoid cyclic calls to this file
 list(REMOVE_ITEM CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR})