Plz help to build

[SaberParker]

/jpountz-lz4-java-969fc61/build.xml:29: Problem: failed to create task or type antlib:org.apache.ivy.ant:resolve
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any / declarations have taken place.
No types or tasks have been defined in this namespace yet

This appears to be an antlib declaration.
Action: Check that the implementing library exists in one of:
-/usr/share/ant/lib
-/Users/User/.ant/lib
-a directory added on the command line with the -lib argument

Total time: 0 seconds

+I have already compiled and add ant-cpp-task

[jpountz]

You need to install Apache Ivy. http://ant.apache.org/ivy/

[SaberParker]

Thank you +, still new-bee to Java XD