Build failure on branch-3.4

Building Zookeeper branch-3.4 fails with Ant, if I try:
ant package:

{{package:
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue
[mkdir] Created dir: /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/test/java
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/test/java
[mkdir] Created dir: /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/main/java
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/main/java
[mkdir] Created dir: /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/main/c
[copy] Copying 15 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/recipes/queue/src/main/c
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper
[mkdir] Created dir: /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/dist-maven
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/dist-maven
[copy] Copying 2 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/dist-maven
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/dist-maven
[copy] Copying 2 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/bin
[copy] Copying 2 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/libexec
[copy] Copying 2 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/sbin
[copy] Copying 3 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/conf
[copy] Copying 304 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/docs
[copy] Copying 7 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT
[copy] Copying 72 files to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/src
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/templates/conf
[copy] Copying 1 file to /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/share/zookeeper/templates/conf

BUILD FAILED
/Users/test/src/zookeeper/build.xml:973: /Users/test/src/zookeeper/build/zookeeper-3.4.14-SNAPSHOT/src/zookeeper-contrib does not exist.
}}

The fileset which tries to locate executables in the contrib area doesn't match anything.