--- doc/CMakeLists.txt.orig	2023-09-24 18:22:03 UTC
+++ doc/CMakeLists.txt
@@ -129,7 +129,7 @@ if(SPHINX)
 
     if (UNIX AND NOT APPLE)
         install(FILES ${QTHELP_DEST} ${QTHELP_IDX}
-                DESTINATION ${CMAKE_INSTALL_DATADIR}/${CMAKE_PROJECT_NAME}/html
+                DESTINATION ${CMAKE_INSTALL_DOCDIR}/html
         )
     elseif (WIN32)
         install(FILES ${QTHELP_DEST} ${QTHELP_IDX}
