problem qbs proj

import qbs.File
import qbs.FileInfo
import qbs.TextFile
import qbs.Process

Project {

    Product {
        name: "AppVer"
        type: ["hpp"]
        builtByDefault: false

        readonly property path ver_file: FileInfo.joinPaths( buildDirectory, "MyAppVer.h" )
        readonly property bool need_update: ( !curver.found ) || ( curver.version != svnver.version )

        readonly property string new_ver: svnver.version
        readonly property string cur_ver: curver.version
        readonly property string new_txt: "#define MY_VERSION " + svnver.version + "\n";

        Probe {
            id: svnver
            property string version

            readonly property path src_dir: product.sourceDirectory
            configure: {
                var p = new Process();
                p.exec( "svnversion", [src_dir], true );
                var txt = p.readStdOut();
                p.close();
                version = '' + parseInt( txt, 10 );
                found = true;
                console.info( 'svn revision: ' + version );
            }
        }

        Probe {
            id: curver
            property string version: '0'
            readonly property path ver_file: product.ver_file
            configure: {
                found = false;
                if ( File.exists( ver_file ) )
                {
                    var f = new TextFile( ver_file );
                    var txt = f.readAll();
                    f.close();
                    var ar = txt.match( /MY_VERSION\s+(\d+)/ );
                    if ( ar !== null && ar !== false )
                    {
                        found = true;
                        version = ar[1];
                        console.info( 'current revision: ' + version );
                    }
                    else
                        console.warning( 'error parsing current revision' );
                }
                else
                    console.info( ver_file + ' not found' );
            }
        }

        Rule {
            multiplex: true
            requiresInputs: false
            alwaysRun: true
            //alwaysRun: need_update
            Artifact { fileTags:["hpp"]; filePath: product.ver_file }
            prepare: {
                var cmd = new JavaScriptCommand();
                cmd.dst = product.ver_file;
                cmd.txt = product.new_txt;
                if ( product.need_update )
                {
                    cmd.description = "Update " + cmd.dst + ' ' + product.cur_ver + ' -> ' + product.new_ver;
                    cmd.sourceCode = function(){
                        var file = new TextFile( dst, TextFile.WriteOnly );
                        file.write( txt );
                        file.close();
                    };
                }
                else
                {
                    cmd.description = "Keep existing " + cmd.dst + " rev. " + product.cur_ver;
                    cmd.sourceCode = function(){};
                }
                return [cmd];
            }
        }

        Export {
            Depends { name: "cpp" }
            cpp.includePaths: [exportingProduct.buildDirectory]
            Group { fileTagsFilter: ["hpp"] }
        }
    }

    CppApplication {
        name: "a"
        consoleApplication: true
        install: true

        Depends { name: "AppVer" }

        files: ["m.cpp"]
    }
}