turbine-5.1-SNAPSHOT install fail problem

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Hello

I download turbine core trunk ( URL:
http://svn.apache.org/repos/asf/turbine/core/trunk ), and tried to install.
But I got error message as below

[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile
(default-compile) on project turbine: Compilation failure

[ERROR]
/Users/youngho1203/project/turbine/src/java/org/apache/turbine/services/schedule/JobEntryPeerImpl.java:[14,48]
error: cannot find symbol

[ERROR]   symbol:   class BaseJobEntryPeerImpl

[ERROR]   location: package org.apache.turbine.services.schedule



Do I need something to install turbine-5.1 ?

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