HTML5Boilerplate build script CSS reference in PHP file

I'm trying to build my site with Html5Boilerplate and for the most parts it's going as I whish. However, I'm still unable to get the CSS reference to update in my PHP file.

My folder structure is as follows:

    css/style.css
    page/header.php

Now in the header.php file I have:

    <!-- scripts concatenated and minified via ant build script-->
        <link rel='stylesheet' href='css/style.css'/>
    <!-- end scripts-->

I would expect the built header.php file to have the following:

    <link rel='stylesheet' href='css/a4cd4c0.css'/>

But unfortunately it is not updating the reference.

In the project.properties file I have: file.pages = page/* and it is stripping the comments in the header.php file, so I know the build script doesn't skip the file.

I have tried variaties, like:

    <!-- CSS concatenated and minified via ant build script-->
        <link rel='stylesheet/css' type='text/css' href='css/style.css'/>
    <!-- end CSS-->

But this hasn't done a thing either . . .

Is there anyone who has tried to update their CSS files with Html5Boilerplate in their PHP files? What could I try to get the reference to be updated by the build script? And my last question is: Could I let the build script update the reference, if I use the following line for including my CSS?

    <link rel='stylesheet/css' type='text/css' href='<?PHP echo(CSS_PATH) ?>style.css'/>

EDIT: By fiddling around in the build.xml file, I have not only got it working, but also with my php echo. Around line 623 of the build.xml file I have changed the lines:

    <replaceregexp match="&lt;link rel=['&quot;]?stylesheet['&quot;]?\s+href=['&quot;]?(.*)/${file.root.stylesheet}(?:\?.*)?['&quot;]?\s*&gt;" 
        replace="&lt;link rel='stylesheet' href='\1/${css.sha}.css'&gt;" flags="m">

to

    <replaceregexp match="href=['&quot;]?(.*\?&gt;)${file.root.stylesheet}(?:\?.*)?['&quot;]?" 
        replace="href='\1${css.sha}.css'" flags="m">

Hopefully this helps someone who is running to a similiar problem.