échec pour compiler I2P

[Francois]

Bonjour,
          j'ai suivi les instructions d'installation d'i2p ici 
http://doc.ubuntu-fr.org/i2p <http://doc.ubuntu-fr.org/i2p>, mais ça 
plante quand je lance "ant pkg".
Question anglais, je suis assez à la rue...
Quelqu'un pourrait-il me dire comment arranger le coup (en vue d'un 
build successful)?**

amicalement

François

Voici le résultat dans les lignes de commande:

pluc at pluc:~/i2p-0.7.10$ ant pkg
Unable to locate tools.jar. Expected to find it in 
/usr/lib/jvm/java-6-sun-1.6.0.17/lib/tools.jar
Buildfile: build.xml

deletepkg-temp:

pkgclean:

clean:

distclean:

clean:
   [delete] Deleting directory /home/pluc/i2p-0.7.10/core/java/build

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

-pre-init:

-init-private:

-init-user:

-init-project:

-init-macrodef-property:

-do-init:

-post-init:

-init-check:

-init-macrodef-javac:

-init-macrodef-junit:

-init-debug-args:

-init-macrodef-nbjpda:

-init-macrodef-debug:

-init-macrodef-java:

-init-presetdef-jar:

init:

deps-clean:

-do-clean:

-post-clean:

clean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:

clean:

distclean:
     [echo] Not actually deleting the jetty libs (since they're so large)

builddepSmall:

depend:

compile:
    [mkdir] Created dir: /home/pluc/i2p-0.7.10/core/java/build
    [mkdir] Created dir: /home/pluc/i2p-0.7.10/core/java/build/obj
    [javac] Compiling 218 source files to 
/home/pluc/i2p-0.7.10/core/java/build/obj

BUILD FAILED
/home/pluc/i2p-0.7.10/build.xml:62: The following error occurred while 
executing this line:
/home/pluc/i2p-0.7.10/core/java/build.xml:23: Unable to find a javac 
compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/java-6-sun-1.6.0.17/jre"

Total time: 2 seconds
pluc at pluc:~/i2p-0.7.10$