try -projecthelp

Options:
-help, -h         print this message
-projecthelp, -p     print project help information
-version          print the version information and exit
-diagnostics       print information that might be helpful to
                diagnose or report problems.
-quiet, -q         be extra quiet
-verbose, -v       be extra verbose
-debug, -d         print debugging information
-emacs, -e         produce logging information without adornments
-lib <path>        specifies a path to search for jars and classes
-logfile <file>     use given file for log
  -l   <file>           ''
-logger <classname>   the class which is to perform logging
-listener <classname> add an instance of class as a project listener
-noinput          do not allow interactive input
-buildfile <file>    use given buildfile
  -file   <file>         ''
  -f     <file>         ''
-D<property>=<value>  use value for given property
-keep-going, -k     execute all targets that do not depend
                on failed target(s)
-propertyfile <name>  load all properties from file with -D
                properties taking precedence
-inputhandler <class> the class which will handle input requests
-find <file>       (s)earch for buildfile towards the root of
  -s <file>       the filesystem and use it
-nice number       A niceness value for the main thread:
                1 (lowest) to 10 (highest); 5 is the default
-nouserlib         Run ant without using the jar files from
${user.home}/.ant/lib
-noclasspath       Run ant without using CLASSPATH
-autoproxy         Java 1.5+ : use the OS proxies
-main <class>       override Ant's normal entry point

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