Run install_name_tool to fix up the executable's rpath

installer/osx/CMakeLists.txt

@@ -23,7 +23,7 @@ if( NOT EXISTS ${macdeployqt_path} )
 endif()
 
 # Run macdeployqt on the bundle at install time.
-set ( macdeployqt_command
+install( CODE
     "execute_process(
         COMMAND ${macdeployqt_path} \"\${CMAKE_INSTALL_PREFIX}/Power Tab Editor.app\" -verbose=2
         RESULT_VARIABLE retval
@@ -33,9 +33,18 @@ set ( macdeployqt_command
     endif ()
     "
 )
-install( CODE ${macdeployqt_command} )
-# Hack: run macdeployqt again to fix missing dependencies.
-install( CODE ${macdeployqt_command} )
+
+# Fix up the executable's rpath, which macdeployqt6 doesn't seem to do anymore...
+install( CODE
+    "execute_process(
+        COMMAND install_name_tool -add_rpath \"@executable_path/../Frameworks\" \"\${CMAKE_INSTALL_PREFIX}/Power Tab Editor.app/Contents/MacOS/Power Tab Editor\"
+        RESULT_VARIABLE retval
+    )
+    if ( NOT retval EQUAL 0 )
+        message( FATAL_ERROR \"Failed to run install_name_tool\" )
+    endif ()
+    "
+)
 
 # Install the Qt translations (macdeployqt doesn't handle this)
 install( FILES ${PTE_QT_TRANSLATION_FILES}