problem in build GNU JavaMail with ant

Hello, i try to build GNU JavaMail with ant but i get the following error : 

gnumail:
    [javac] Compiling 115 source files to G:\Fh-muehcne\mail-1.0\classes
    [javac] G:\Fh-muehcne\mail-1.0\source\javax\mail\Session.java:39: package gn
u.inet.util does not exist
    [javac] import gnu.inet.util.Logger;
    [javac]                      ^


any can help please?

ps: i just need the package, i wonder that there is no jar file for GNU JavaMail, and that i have to build from source!

thanks.

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