compile-core-test fails to compile

compile-core-test fails to compile on branch-0.18

compile-core-test:
[javac] Compiling 7 source files to /branch-0.18/build/test/classes
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] Compiling 238 source files to /branch-0.18/build/test/classes
[javac] /branch-0.18/src/test/org/apache/hadoop/mapred/TestJobShell.java:27: package org.apache.hadoop.hdfs does not exist
[javac] import org.apache.hadoop.hdfs.MiniDFSCluster;
[javac] ^
[javac] /branch-0.18/src/test/org/apache/hadoop/mapred/TestJobShell.java:38: cannot find symbol
[javac] symbol : class MiniDFSCluster
[javac] location: class org.apache.hadoop.mapred.TestJobShell
[javac] MiniDFSCluster dfs = null;
[javac] ^
[javac] /branch-0.18/src/test/org/apache/hadoop/mapred/TestJobShell.java:45: cannot find symbol
[javac] symbol : class MiniDFSCluster
[javac] location: class org.apache.hadoop.mapred.TestJobShell
[javac] dfs = new MiniDFSCluster(conf, 2 , true, null);
[javac] ^
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] 3 errors