I am seeing this error running mach5 builds,

[linux-x64] ./closed/conf/jib-profiles.js:14 SyntaxError: /scratch/jenkins/workspace/9-dev/common/conf/jib-profiles.js:254:17 Expected , but found --with-zlib=system
[linux-x64] "--with-zlib=system"),
[linux-x64] ^
[linux-x64] [jib ERR] Failed to parse profile configuration

It looks like this change, http://hg.openjdk.java.net/jdk9/dev/rev/1e97e2ae06f9, intentionally put it like
        "linux-x86": \{
            target_os: "linux",
            target_cpu: "x86",
            build_cpu: "x64",
            dependencies: concat(common.dependencies, "devkit"),
            configure_args: concat(common.configure_args, common.configure_args_32bit
                "--with-zlib=system"),
            make_args: common.make_args
        \},

with no comma after 'common.configure_args_32bits'.