what does 'ant.file.alfresco' mean ?

[zengqingyi12]

I need to config build.xml then I can import it into eclipse, but I found there is a setting:

<project name="alfresco"
         default="build-tomcat" >
   <dirname property="alfresco.basedir" file="${ant.file.alfresco}"/>


   <!– ****************************************************** –>
   <!– ************ Initialisation/Configuration ************ –>
   <!– ****************************************************** –>

   <import file="${alfresco.basedir}/macros.xml" />
   <import file="${alfresco.basedir}/projects.xml" />

I don't know how to set ${ant.file.alfresco} then I can successfully import the whole project into eclipse.
I know that ant.file is the directory that ant.exe exist, but what doese "ant.file.alfresco" mean ?

[invictus9]

ant.file.alfresco is set in a properties file (file ending with .properties) in your environment. Set the value of that property accordingly.

[zengqingyi12]

ant.file.alfresco is set in a properties file (file ending with .properties) in your environment. Set the value of that property accordingly.

What's the name of the properties file ? Where can I find it ?