From e9a8853aa45f5762265cc91aa62fd917a116b38e Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Fri, 16 Aug 2024 15:56:03 +0200
Subject: [PATCH] CMake: add FLTKConfigVersion.cmake

This file enables consumers to search for a particular FLTK version.

Note: backported from 'master' to support parallel installation of
1.3.10 (1.3.x) and 1.4.0 (1.4.x) or any higher version on one system.
---
 CMakeLists.txt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d0523d64..de50a435c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -124,6 +124,22 @@ if (FLTK_BUILD_EXAMPLES)
   add_subdirectory (examples)
 endif (FLTK_BUILD_EXAMPLES)
 
+#######################################################################
+# create and install version config file 'FLTKConfigVersion.cmake'
+#######################################################################
+
+include(CMakePackageConfigHelpers)
+
+write_basic_package_version_file(FLTKConfigVersion.cmake
+  # [VERSION requiredVersion]       # defaults to project version
+  COMPATIBILITY SameMinorVersion
+)
+
+install(FILES
+  ${CMAKE_CURRENT_BINARY_DIR}/FLTKConfigVersion.cmake
+  DESTINATION ${FLTK_CONFIG_PATH}
+)
+
 #######################################################################
 # installation
 #######################################################################