OpenJDK 8 is an open source implementation of version 8 of the Java Development Kit, Standard Edition. It includes tools for developing, testing, and running programs written in Java. Before installing this package please consider any other jdk's/jre's that you have already installed as they may cause conflicts with the PATH, JAVA_HOME and MANPATH variables (this includes the 'openjdk' dependency package -- you may wish to remove it after you're done.) After installing the package you will need to logout/reboot your machine as it will add new files to the /etc/profile.d folder. This script may take a couple of hours to complete and will require about 11 GB of disk space for its temporary directory. It defaults to "/tmp/SBo" and you may redefine it like this: TMP=/your/temporary/dir ./openjdk8.SlackBuild The 'cacerts' binary is a keystore containing CA certificates which are used by Java applications. It is taken from the CentOS package 'ca-certificates-2015.2.4-65.0.1.el6_6.noarch.rpm'. If you get an error like Internal compiler error: java.lang.NullPointerException at org.eclipse.jdt.internal.compiler.ReadManager.run(ReadManager.java:166) simply run the build again. This happens early so it shouldn't be that of a problem. At least 1 out of 5 runs so far have always succeded.