Not working properly when concat font-awesome css file

[dyzdyz010]

I use gulp-concat to build my css. Infont-awesome.css, it's font paths are:

src: url('../fonts/fontawesome-webfont.eot?v=4.3.0');
src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.3.0') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff2?v=4.3.0') format('woff2'), url('../fonts/fontawesome-webfont.woff?v=4.3.0') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=4.3.0') format('truetype'), url('../fonts/fontawesome-webfont.svg?v=4.3.0#fontawesomeregular') format('svg');

My gulpfile.js

gulp.task('styles', function() {
    return gulp.src(['assets/css/*.css', 'assets/bower_components/fontawesome/css/font-awesome.css'])
        .pipe(concatCss('build.min.css'))
        .pipe(gulp.dest('dist/css'))
        .pipe(notify({message: 'Style task complete.'}));
});

But in my build.min.css, the font paths have been somehow changed to:

src: url("../bower_components/fontawesome/fonts/fontawesome-webfont.eot?v=4.3.0");
src: url("../bower_components/fontawesome/fonts/fontawesome-webfont.eot?#iefix&v=4.3.0") format('embedded-opentype'), url("../bower_components/fontawesome/fonts/fontawesome-webfont.woff2?v=4.3.0") format('woff2'), url("../bower_components/fontawesome/fonts/fontawesome-webfont.woff?v=4.3.0") format('woff'), url("../bower_components/fontawesome/fonts/fontawesome-webfont.ttf?v=4.3.0") format('truetype'), url("../bower_components/fontawesome/fonts/fontawesome-webfont.svg?v=4.3.0#fontawesomeregular") format('svg');

So why they're not the same with the original file?

[yocontra]

What is "concatCss"?

[dyzdyz010]

Oh sorry I posted on a wrong repo...