create & install exiv2ConfigVersion.cmake

src/CMakeLists.txt

@@ -6,6 +6,7 @@ if( EXIV2_BUILD_UNIT_TESTS )
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON) # Requires CMake 3.3.3
 endif()
 
+include(CMakePackageConfigHelpers)
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
@@ -113,7 +114,7 @@ if( EXIV2_ENABLE_PNG )
 endif()
 
 if( EXIV2_ENABLE_VIDEO )
-    target_sources(exiv2lib PRIVATE 
+    target_sources(exiv2lib PRIVATE
         asfvideo.cpp            ../include/exiv2/asfvideo.hpp
         matroskavideo.cpp       ../include/exiv2/matroskavideo.hpp
         quicktimevideo.cpp      ../include/exiv2/quicktimevideo.hpp
@@ -224,6 +225,7 @@ if( ICONV_FOUND )
     target_link_libraries( exiv2lib PRIVATE Iconv::Iconv )
 endif()
 
+write_basic_package_version_file(exiv2ConfigVersion.cmake COMPATIBILITY ExactVersion)
 
 install(TARGETS exiv2lib EXPORT exiv2Config
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
@@ -239,6 +241,8 @@ install(FILES
 
 install(EXPORT exiv2Config DESTINATION "share/exiv2/cmake")
 
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/exiv2ConfigVersion.cmake DESTINATION "share/exiv2/cmake")
+
 # ******************************************************************************
 # exiv2 application