Looks like the top-level build is broken. It seems to have issues with the ICEchat sample:

...
compile:
     [echo] Compiling icechat-icefaces2...
    [javac] Compiling 3 source files to /Users/jack/Projects/ICEsoft/ICEfaces/ossrepo/scratchpads/snowplow/samples/icechat/icefaces/build/classes
    [javac] javac: invalid target release: 1.6
    [javac] Usage: javac <options> <source files>
    [javac] where possible options include:
    [javac] -g Generate all debugging info
    [javac] -g:none Generate no debugging info
    [javac] -g:{lines,vars,source} Generate only some debugging info
    [javac] -nowarn Generate no warnings
    [javac] -verbose Output messages about what the compiler is doing
    [javac] -deprecation Output source locations where deprecated APIs are used
    [javac] -classpath <path> Specify where to find user class files
    [javac] -cp <path> Specify where to find user class files
    [javac] -sourcepath <path> Specify where to find input source files
    [javac] -bootclasspath <path> Override location of bootstrap class files
    [javac] -extdirs <dirs> Override location of installed extensions
    [javac] -endorseddirs <dirs> Override location of endorsed standards path
    [javac] -d <directory> Specify where to place generated class files
    [javac] -encoding <encoding> Specify character encoding used by source files
    [javac] -source <release> Provide source compatibility with specified release
    [javac] -target <release> Generate class files for specific VM version
    [javac] -version Version information
    [javac] -help Print a synopsis of standard options
    [javac] -X Print a synopsis of nonstandard options
    [javac] -J<flag> Pass <flag> directly to the runtime system
    [javac]

BUILD FAILED
/Users/jack/Projects/ICEsoft/ICEfaces/ossrepo/scratchpads/snowplow/build.xml:96: The following error occurred while executing this line:
/Users/jack/Projects/ICEsoft/ICEfaces/ossrepo/scratchpads/snowplow/samples/icechat/icefaces/build.xml:23: The following error occurred while executing this line:
/Users/jack/Projects/ICEsoft/ICEfaces/ossrepo/scratchpads/snowplow/build-common.xml:91: Compile failed; see the compiler error output for details.