diff -up utfcpp-3.2.4/CMakeLists.txt.noarch utfcpp-3.2.4/CMakeLists.txt
--- utfcpp-3.2.4/CMakeLists.txt.noarch	2023-08-31 14:09:08.102223665 +0200
+++ utfcpp-3.2.4/CMakeLists.txt	2023-08-31 14:09:32.632366839 +0200
@@ -24,7 +24,7 @@ if(UTF8_INSTALL)
         set(DEF_INSTALL_CMAKE_DIR CMake)
     else()
         include(GNUInstallDirs) # define CMAKE_INSTALL_*
-        set(DEF_INSTALL_CMAKE_DIR ${CMAKE_INSTALL_LIBDIR}/cmake/utf8cpp)
+        set(DEF_INSTALL_CMAKE_DIR ${CMAKE_INSTALL_DATADIR}/cmake/utf8cpp)
     endif()
 
     if(${CMAKE_VERSION} VERSION_GREATER "3.14")