How to Get SVN version code in qt pro file

[Abel]

Hi All,
I want to update the svn code automaticly when build my program by this way:
In my project's pro file, I add following code to get snv code, but it does not work.

SVNVERSION = $$system(svn info -r HEAD ../ | sed -n "/Revision/p" | sed  "s/[^0-9]//g")
DEFINES += VER=$${SVNVERSION}

SVNVERSION = $$system(svn info -r HEAD ../ | sed -n "/Revision/p" | sed  "s/[^0-9]//g")
DEFINES += VER=$${SVNVERSION}

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The define in the makefile is not correct:
-DVER=Revision: -DQT_DLL -DQT

I try the sed commad in command window, it works well:
D:\Aic\FirmwareServer\QtProject>svn info -r HEAD ../ | sed -n "/Revision/p" | se
d "s/[^0-9]//g"
471

Is there any suggestion to solve this problem?