From aa317de2db1ede4664cba15f8d08657714d37038 Mon Sep 17 00:00:00 2001
From: Will Sciaroni <wsciaroni@protonmail.com>
Date: Thu, 22 May 2025 09:06:06 +0000
Subject: [PATCH] Restore CMake < 3.14 compatibility (#1098)

---
 CMakeLists.txt | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8dd4b504..cbe4564d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,11 +52,24 @@ if(${CMAKE_PROJECT_NAME} STREQUAL ${PROJECT_NAME})
     )
     if(ETL_VERSION)
         # Generate the package configuration files using CMake provided macros
-        write_basic_package_version_file(
-            "${PROJECT_NAME}ConfigVersion.cmake"
-            COMPATIBILITY SameMajorVersion
-            ARCH_INDEPENDENT
-        )
+        if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.14)
+            # Generate the package configuration files using CMake provided macros
+            write_basic_package_version_file(
+                "${PROJECT_NAME}ConfigVersion.cmake"
+                COMPATIBILITY SameMajorVersion
+                ARCH_INDEPENDENT
+            )
+        else()
+            # This is needed for CMake < 3.14
+            # because the ARCH_INDEPENDENT option is not available
+            # in CMake < 3.14
+            # See https://cmake.org/cmake/help/latest/module/CMakePackageConfigHelpers.html
+            # for more information
+            write_basic_package_version_file(
+                "${PROJECT_NAME}ConfigVersion.cmake"
+                COMPATIBILITY SameMajorVersion
+            )
+        endif()
     endif()
     configure_package_config_file(
         "${PROJECT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in"