$ ant
Buildfile: build.xml

init:

checkjars:

core:
    [javac] Compiling 804 source files to /home/david/Programmes/FrostWire/frostwire/core
    [javac] /home/david/Programmes/FrostWire/frostwire/core/com/limegroup/bittorrent/disk/MMDiskController.java:185: warning: sun.misc.Cleaner is Sun proprietary API and may be removed in a future release
    [javac]                                     sun.misc.Cleaner cleaner =
    [javac]                                             ^
    [javac] /home/david/Programmes/FrostWire/frostwire/core/com/limegroup/bittorrent/disk/MMDiskController.java:186: warning: sun.misc.Cleaner is Sun proprietary API and may be removed in a future release
    [javac]                                             (sun.misc.Cleaner)getCleanerMethod.invoke(buffer,new Object[0]);
    [javac]                                                      ^
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 2 warnings

BUILD SUCCESSFUL
Total time: 16 seconds

then

$ ant
Buildfile: build.xml

init:

checkjars:

clientonly:
    [javac] Compiling 816 source files to /home/david/Programmes/FrostWire/frostwire/gui
    [javac] /home/david/Programmes/FrostWire/frostwire/gui/com/limegroup/gnutella/gui/sponsors/SponsorBanner.java:111: illegal escape character
    [javac]                                     ipranges_string = ipranges_string.replaceAll("\s","");
    [javac]                                                                                    ^
    [javac] 1 error

BUILD FAILED
/home/david/Programmes/FrostWire/frostwire/gui/build.xml:51: Compile failed; see the compiler error output for details.

Total time: 4 seconds