Library installation not obeying CMAKE_INSTALL_LIBDIR

-DCMAKE_INSTALL_LIBDIR=lib64
-DCMAKE_INSTALL_PREFIX=$HOME/obj/qt/installed
-DCMAKE_INSTALL_RPATH=$HOME/obj/qt/installed/lib64

$ ls ~/obj/qt/installed/lib64/qtcreator
ls: cannot access '/home/tjmaciei/obj/qt/installed/lib64/qtcreator': No such file or directory
$  ls ~/obj/qt/installed/lib/qtcreator        
libAdvancedDockingSystem.so.16       libExtensionSystem.so.16.0.82         libModeling.so.16          libQmlEditorWidgets.so.16.0.82  libUtils.so.16
libAdvancedDockingSystem.so.16.0.82  libGLSL.so.16                         libModeling.so.16.0.82     libQmlJS.so.16                  libUtils.so.16.0.82
libAggregation.so.16                 libGLSL.so.16.0.82                    libNanotrace.so.16         libQmlJS.so.16.0.82             libyaml-cpp.so.16
libAggregation.so.16.0.82            libKSyntaxHighlighting.so.16          libNanotrace.so.16.0.82    libqtkeychain.so.16             libyaml-cpp.so.16.0.82
libCmdBridgeClient.so.16             libKSyntaxHighlighting.so.16.0.82     libProParser.so.16         libqtkeychain.so.16.0.82        libZip.so.16
libCmdBridgeClient.so.16.0.82        libLanguageServerProtocol.so.16       libProParser.so.16.0.82    libTerminalLib.so.16            libZip.so.16.0.82
libCPlusPlus.so.16                   libLanguageServerProtocol.so.16.0.82  libQmlDebug.so.16          libTerminalLib.so.16.0.82       plugins
libCPlusPlus.so.16.0.82              libLanguageUtils.so.16                libQmlDebug.so.16.0.82     libTracing.so.16
libExtensionSystem.so.16             libLanguageUtils.so.16.0.82           libQmlEditorWidgets.so.16  libTracing.so.16.0.82