Gradle 2.1 build from source failed with TaskExecutionException: reference to UncheckedIOException is ambiguous

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On OS X 10.9.3, Oracle JDK 1.8.0_05, version.txt says 2.1.

Cloned git repo, tried to build with

./gradlew build

.

Build failed:

gradle/subprojects/plugin-use/src/main/java/org/gradle/plugin/use/resolve/service/internal/PluginResolutionServiceClient.java:105: error: reference to UncheckedIOException is ambiguous
            throw new UncheckedIOException(e);
                      ^
  both class java.io.UncheckedIOException in java.io and class org.gradle.api.UncheckedIOException in org.gradle.api match
1 error
:pluginUse:compileJava FAILED
  FAILURE: Build failed with an exception.
  * What went wrong:
Execution failed for task ':pluginUse:compileJava'.
> Compilation failed; see the compiler error output for details.
  * Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':pluginUse:compileJava'.
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
        .......(more).......