$NetBSD: patch-CMakeLists.txt,v 1.6 2023/12/05 18:10:56 adam Exp $

Do not install includes in a sub-directory.
Install cmake files into lib/cmake.

--- CMakeLists.txt.orig	2023-12-03 23:03:19.000000000 +0000
+++ CMakeLists.txt
@@ -10,7 +10,7 @@ include(GNUInstallDirs)
 
 target_include_directories(utf8cpp INTERFACE
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>"
-    $<INSTALL_INTERFACE:include/utf8cpp>
+    $<INSTALL_INTERFACE:include>
 )
 
 include(CMakePackageConfigHelpers)
@@ -32,18 +32,18 @@ install(TARGETS ${PROJECT_NAME}
 configure_package_config_file(
     "${PROJECT_SOURCE_DIR}/${PROJECT_NAME}Config.cmake.in"
     "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-    INSTALL_DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
 )
 
 install(EXPORT ${PROJECT_NAME}Targets
         FILE ${PROJECT_NAME}Targets.cmake
         NAMESPACE ${PROJECT_NAME}::
-        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
 install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
               "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
-install(FILES ${PROJECT_SOURCE_DIR}/source/utf8.h DESTINATION include/utf8cpp)
+install(FILES ${PROJECT_SOURCE_DIR}/source/utf8.h DESTINATION include)
 install(DIRECTORY ${PROJECT_SOURCE_DIR}/source/utf8 DESTINATION
-        include/utf8cpp)
+        include)