diff --git a/build.xml b/build.xml
--- a/build.xml
+++ b/build.xml
@@ -2,22 +2,15 @@
 <project name="notifications" default="full-build">
  <!-- By default, we assume all tools to be on the $PATH -->
  <property name="composer" value="composer"/>
- <property name="pdepend" value="pdepend"/>
  <property name="phpcpd"  value="phpcpd"/>
- <property name="phpcs"   value="phpcs"/>
  <property name="phpdox"  value="phpdox"/>
  <property name="phploc"  value="phploc"/>
- <property name="phpmd"   value="phpmd"/>
- <property name="phpunit" value="phpunit"/>
 
- <!-- Use this when the tools are managed by Composer in ${basedir}/vendor/bin
+ <!-- Some tools are managed by Composer. -->
  <property name="pdepend" value="${basedir}/vendor/bin/pdepend"/>
- <property name="phpcpd"  value="${basedir}/vendor/bin/phpcpd"/>
  <property name="phpcs"   value="${basedir}/vendor/bin/phpcs"/>
- <property name="phpdox"  value="${basedir}/vendor/bin/phpdox"/>
- <property name="phploc"  value="${basedir}/vendor/bin/phploc"/>
  <property name="phpmd"   value="${basedir}/vendor/bin/phpmd"/>
- <property name="phpunit" value="${basedir}/vendor/bin/phpunit"/> -->
+ <property name="phpunit" value="${basedir}/vendor/bin/phpunit"/>
 
  <target name="full-build"
          depends="prepare,static-analysis,phpunit,phpdox,-check-failure"
@@ -233,7 +226,10 @@
          unless="phpunit.done"
          depends="prepare"
          description="Run unit tests with PHPUnit">
-  <exec executable="${phpunit}" resultproperty="result.phpunit" taskname="phpunit">
+  <exec executable="php" resultproperty="result.phpunit" taskname="phpunit">
+   <arg value="-dzend_extension=xdebug.so" />
+   <arg value="-dxdebug.mode=coverage" />
+   <arg value="${phpunit}" />
    <arg value="--configuration"/>
    <arg path="${basedir}/phpunit.xml"/>
   </exec>