Logstash 1.2.0 daily builds fail

Description

Could you please fix the problem that makes the daily builds on http://build.logstash.net/job/ fail? They seem to fail for a whole month now for always the same reason, and I am very interested to get a recent logstash build since it contains elasticsearch version 0.90 that can compress the data. Thanks so much!
(BTW: Could you please use 0.90.2? Upgrading is recommended.)

The console output says:

+ make jar
make[1]: Entering directory `/home/app/jenkins/.jenkins/jobs/logstash.jar.daily/workspace/lib/logstash/config'
tt grammar.treetop
make[1]: tt: Command not found
make[1]: *** [grammar.rb] Error 127
make[1]: Leaving directory `/home/app/jenkins/.jenkins/jobs/logstash.jar.daily/workspace/lib/logstash/config'
make: *** [lib/logstash/config/grammar.rb] Error 2
Build step 'Execute shell' marked build as failure

Environment

None

Status

Assignee

Logstash Developers

Reporter

Hans-Peter Störr

Labels

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Fix versions

Affects versions

Priority

Configure