test-clientutil-jar unit test fails

test-clientutil-jar:
    [junit] Testsuite: org.apache.cassandra.serializers.ClientUtilsTest
    [junit] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.314 sec
    [junit] 
    [junit] Testcase: test(org.apache.cassandra.serializers.ClientUtilsTest):   Caused an ERROR
    [junit] org/apache/cassandra/utils/SigarLibrary
    [junit] java.lang.NoClassDefFoundError: org/apache/cassandra/utils/SigarLibrary
    [junit]     at org.apache.cassandra.utils.UUIDGen.hash(UUIDGen.java:328)
    [junit]     at org.apache.cassandra.utils.UUIDGen.makeNode(UUIDGen.java:307)
    [junit]     at org.apache.cassandra.utils.UUIDGen.makeClockSeqAndNode(UUIDGen.java:256)
    [junit]     at org.apache.cassandra.utils.UUIDGen.<clinit>(UUIDGen.java:39)
    [junit]     at org.apache.cassandra.serializers.ClientUtilsTest.test(ClientUtilsTest.java:56)
    [junit] Caused by: java.lang.ClassNotFoundException: org.apache.cassandra.utils.SigarLibrary
    [junit]     at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    [junit]     at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    [junit]     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    [junit]     at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    [junit] 
    [junit] 
    [junit] Test org.apache.cassandra.serializers.ClientUtilsTest FAILED

BUILD FAILED