How to set the project find qt59's modules?

[sunyuzhe2017]

Ubuntu 16.04,ros kinetic,I installed qt59 at /opt/qt59
I created a project with 'catkin_create_qt_pkg'command ,then the CMakeLists file is build with QT4,which from "/usr/include/qt4",I change the CMakeLists file to qt5,like follow sentences:

cmake_minimum_required(VERSION 2.8.0)
project(test1)
set(CMAKE_INCLUDE_CURRENT_DIR ON)#added necessary
##############################################################################
# Catkin
##############################################################################

# qt_build provides the qt cmake glue, roscpp the comms for a default talker
find_package(catkin REQUIRED COMPONENTS roscpp)
find_package(Qt5 REQUIRED Core Widgets)#added
set(QT_LIBRARIES Qt5::Widgets)#added
include_directories(${catkin_INCLUDE_DIRS})

# Use this to define what the package will export (e.g. libs, headers).
# Since the default here is to produce only a binary, we don't worry about
# exporting anything. 
catkin_package()
##############################################################################
# Qt Environment
##############################################################################
# this comes from qt_build's qt-ros.cmake which is automatically 
# included via the dependency call in package.xml
#rosbuild_prepare_qt4(QtCore QtGui) # Add the appropriate components to the component list here
##############################################################################
# Sections
##############################################################################
file(GLOB QT_FORMS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} ui/*.ui)
file(GLOB QT_RESOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} resources/*.qrc)
file(GLOB_RECURSE QT_MOC RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} FOLLOW_SYMLINKS include/test1/*.hpp)

QT5_ADD_RESOURCES(QT_RESOURCES_CPP ${QT_RESOURCES})
QT5_WRAP_UI(QT_FORMS_HPP ${QT_FORMS})
QT5_WRAP_CPP(QT_MOC_HPP ${QT_MOC}) 

then I find that the Qt modules path changed to "/usr/lib/x86_64-linux-gnu/qt5",still it wasn't from qt59 (/opt/qt59),how could I change the CMakeLists file to make cmake find qt modules from /opt/qt59?
I have searched for several days ,tried like change set(CMAKE_PREFIX_PATH /opt/qt59)and so on,but all that doesn't work,so I 'm here looking for help from you.
I do appreciate if you could give me some advices about how to change the CMakeLists file to make it find Qt modules from the set path "/opt/qt59".

[stonier]

You'll need to dig deeper into /opt/qt59 to find the path to the cmake modules, not the root of qt5. e.g. I have /usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5Config.cmake on my system, so probably setting CMAKE_PREFIX_PATH to /usr/lib/x86_64-linux-gnu/cmake/ or /usr/lib/x86_64-linux-gnu/cmake/Qt5 would work.

[sunyuzhe2017]

I'm sorry for reply you so late,I have tried ,it still doesn't work.I think I need to rebuild qt59 in my computer,or it can not find the qt59's cmake file.Thanks.