From 189db8deef988d66146be4a35a6211800e30aced Mon Sep 17 00:00:00 2001
From: Dinesh Bolkensteyn <dinesh@dinsoft.net>
Date: Mon, 18 Jul 2016 11:12:04 +0200
Subject: [PATCH] CMake: Keep compat only with same major version & remove
 CMakePackageConfigHelpers dependency

---
 CMakeLists.txt            |  9 ++-------
 cmake/serialVersion.cmake | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 7 deletions(-)
 create mode 100644 cmake/serialVersion.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 71ab4c2..700444c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.8)
+cmake_minimum_required(VERSION 2.8.3)
 project(serial)
 
 if(APPLE)
@@ -62,12 +62,7 @@ install(FILES include/serial/serial.h include/serial/v8stdint.h
 ## Install CMake files
 install(EXPORT ${PROJECT_NAME}-targets DESTINATION ${INSTALL_CMAKE_DIR})
 
-include(CMakePackageConfigHelpers)
-write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Version.cmake
-    VERSION 1.2.1
-    COMPATIBILITY AnyNewerVersion)
-
-install(FILES ${CMAKE_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Version.cmake
+install(FILES ${CMAKE_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake ${CMAKE_SOURCE_DIR}/cmake/${PROJECT_NAME}Version.cmake
         DESTINATION ${INSTALL_CMAKE_DIR})
 
 ## Tests
diff --git a/cmake/serialVersion.cmake b/cmake/serialVersion.cmake
new file mode 100644
index 0000000..cf8dbb5
--- /dev/null
+++ b/cmake/serialVersion.cmake
@@ -0,0 +1,21 @@
+set(PACKAGE_VERSION "1.2.1")
+
+if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+  if(PACKAGE_VERSION MATCHES "^([0-9]+)\\.")
+    set(CVF_VERSION_MAJOR "${CMAKE_MATCH_1}")
+  else()
+    set(CVF_VERSION_MAJOR PACKAGE_VERSION)
+  endif()
+
+  if(PACKAGE_FIND_VERSION_MAJOR STREQUAL CVF_VERSION_MAJOR)
+    set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  else()
+    set(PACKAGE_VERSION_COMPATIBLE FALSE)
+  endif()
+
+  if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
+      set(PACKAGE_VERSION_EXACT TRUE)
+  endif()
+endif()