How can the Ant build system indicate that one of the tasks has already been completed?

Question

Apache Ant

Naturally, the task has not been completed - I just would like to skip it without changing build.xml (it cannot be changed).

Answer 1

make a condition on the environment variable at the beginning of the task - and set it if it is not necessary to execute it
ant-contrib.sourceforge.net/ant-contrib/manual/tasks/if.html