Ant build successful but doesn't compile CSS, what could be wrong? - ant

Question

I'm having a problem where the CSS isn't compiled at all. Ant seems to work as expected, nothing happens with my CSS files though.
Can anyone help figure out why my CSS isn't compiling?
Here's the output from running ant -v
$ ant -v
Apache Ant(TM) version 1.8.2 compiled on December 3 2011
Trying the default build file: build.xml
Buildfile: /var/www/testsite/build.xml
Detected Java version: 1.6 in: /usr/lib/jvm/java-6-openjdk-amd64/jre
Detected OS: Linux
parsing buildfile /var/www/testsite/build.xml with URI = file:/var/www/testsite/build.xml
Project base dir set to: /var/www/testsite/www
parsing buildfile jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
Override ignored for property "TODAY"
[property] Loading /var/www/testsite/www/build.properties
BUILD SUCCESSFUL
Total time: 0 seconds
graeme#ubuntu:/var/www/testsite$ ant -v
Apache Ant(TM) version 1.8.2 compiled on December 3 2011
Trying the default build file: build.xml
Buildfile: /var/www/testsite/build.xml
Detected Java version: 1.6 in: /usr/lib/jvm/java-6-openjdk-amd64/jre
Detected OS: Linux
parsing buildfile /var/www/testsite/build.xml with URI = file:/var/www/testsite/build.xml
Project base dir set to: /var/www/testsite/www
parsing buildfile jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
Override ignored for property "TODAY"
[property] Loading /var/www/testsite/www/build.properties
BUILD SUCCESSFUL
Total time: 0 seconds
Here's my build.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project name="testsite.co.uk" basedir="./www">
<tstamp>
<format property="TODAY" pattern="yyyy-M-dd-hh-mm" locale="en,UK"/>
</tstamp>
<taskdef resource="net/sf/antcontrib/antcontrib.properties">
<classpath>
<pathelement location="/usr/share/java/ant-contrib.jar"/>
</classpath>
</taskdef>
<property
name="yui-compressor.jar"
location="/home/testsite/Downloads/yui-ant/lib/yuicompressor-2.4.2.jar" />
<property
name="yui-compressor-ant-task.jar"
location="/home/testsite/Downloads/yui-ant/bin/yui-compressor-ant-task-0.5.1.jar" />
<path id="task.classpath">
<pathelement location="${yui-compressor.jar}" />
<pathelement location="${yui-compressor-ant-task.jar}" />
<pathelement location="/home/testsite/Downloads/yui-ant/lib/rhino-js-1.6r7.jar" />
<pathelement location="/home/testsite/Downloads/znerd-optipng-ant-task-ff33669/build/optipng-ant-task.jar" />
</path>
<taskdef
name="yui-compressor"
classname="net.noha.tools.ant.yuicompressor.tasks.YuiCompressorTask">
<classpath refid="task.classpath" />
</taskdef>
<taskdef name="optipng" classname="com.pensioenpage.jynx.optipng.OptiPNGTask" classpath="/home/testsite/Downloads/znerd-optipng-ant-task-ff33669/build/optipng-ant-task.jar" />
<property file="build.properties" />
<target name="export">
<tar destfile="./exported_latest_update_${TODAY} ${TSTAMP}.tar"
basedir="./"
includes = "www/**"
excludes=".git/**, .gitignore/**, www/secure/images/categories/**, www/secure/images/content/**, www/secure/images/products/**, www/secure/images/widgets/**">
<date datetime="08/14/2009 10:00 AM" when="after"/>
</tar>
</target>
<target name="css-frontend">
<property name="cssFilePath" value="./www/css"/>
<property name="cssUrlPath" value="/css"/>
<property name="frontendCss" value="build.frontend"/>
<delete>
<fileset dir="./www/css" includes="build.frontend.*.css" />
</delete>
<concat destfile="${cssFilePath}/${frontendCss}.css">
<fileset dir="./www/css" includes="reset.css" />
<fileset dir="./www/css" includes="text.css" />
<!--<fileset dir="./www/css" includes="forms.css" />-->
<fileset dir="./www/css" includes="tables.css" />
<fileset dir="./www/css" includes="vendor-logos.css" />
<fileset dir="./www/lib/javascript/fancybox2/" includes="jquery.fancybox.css" />
<!--<fileset dir="./www/css" includes="wp-panel.css" />-->
<fileset dir="./www/lib/javascript/jQuery.mmenu-master/dist/css" includes="jquery.mmenu.custom.css" />
<fileset dir="./www/css" includes="styles-2015.css" />
<fileset dir="./www/css" includes="loop54-styles.css" />
<fileset dir="./www/css" includes="feature_icons.css" />
<fileset dir="./www/css" includes="shopzilla.override.css" />
<fileset dir="./www/css/responsive-2015" includes="below-1100.css" />
<fileset dir="./www/css/responsive-2015" includes="below-1024.css" />
<fileset dir="./www/css/responsive-2015" includes="below-980.css" />
<fileset dir="./www/css/responsive-2015" includes="above-980.css" />
<fileset dir="./www/css/responsive-2015" includes="below-690.css" />
<fileset dir="./www/css/responsive-2015" includes="below-500.css" />
<fileset dir="./www/css/responsive-2015" includes="below-320.css" />
<fileset dir="./www/css/responsive-2015" includes="retina-screens.css" />
</concat>
<concat destfile="${cssFilePath}/build.wp-style.css">
<fileset dir="./www/css" includes="reset.css" />
<fileset dir="./www/css" includes="text.css" />
<fileset dir="./www/css" includes="vendor-logos.css" />
<fileset dir="./www/css" includes="wp-style.css" />
</concat>
<concat destfile="${cssFilePath}/build.checkout.css">
<fileset dir="./www/lib/javascript/fancybox2/" includes="jquery.fancybox.css" />
<fileset dir="./www/css" includes="reset.css" />
<fileset dir="./www/css" includes="text.css" />
<fileset dir="./www/css" includes="forms.css" />
<fileset dir="./www/css" includes="tables.css" />
<!--<fileset dir="./www/css" includes="wp-panel.css" />-->
<fileset dir="./www/css" includes="one-page-checkout.css" />
</concat>
<checksum file="${cssFilePath}/${frontendCss}.css" property="css_md5"/>
<property name="frontendCssMd5" value="build.frontend"/>
<move file="${cssFilePath}/${frontendCss}.css" tofile="${cssFilePath}/${frontendCssMd5}.css"/>
<yui-compressor
warn="false"
munge="true"
preserveallsemicolons="false"
fromdir="${cssFilePath}"
todir="${cssFilePath}/">
<include name="${frontendCssMd5}.css" />
<include name="build.wp-style.css" />
<include name="build.checkout.css" />
<include name="720plus.css" />
<include name="719minus.css" />
</yui-compressor>
</target>
</project>