Postgres jdbc build broken with plain ant since e7c2c93

Hi all,

Build of jdbc is broken since commit e7c2c93 of yesterday when trying
to run it with a simple ant. Here is the failure happening:
$ ant
Buildfile: /home/mpaquier/git/pgjdbc/build.xml

BUILD FAILED
/home/mpaquier/git/pgjdbc/build.xml:109: Problem: failed to create
task or type antlib:org.apache.maven.artifact.ant:dependencies
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> 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/apache-ant/lib
-/home/mpaquier/.ant/lib
-a directory added on the command line with the -lib argument

Total time: 0 seconds

Reproduced with both ant 1.7.1 and 1.9.3.
Am I missing something like an entry in CLASSPATH? This was not
necessary up to now.
Regards,
--
Michael