mercury:graal-core $ mx build Please select a default JDK: Enter path of JDK: /local/mercury/local/graal/labsjdk1.8.0_92-jvmci-0.21/ The VM does not support the minimum JVMCI API version required by Graal: 0.21 < 0.22. This is the VM from http://www.oracle.com/technetwork/oracle-labs/program-languages/downloads/index.html Andrew.