problem with Zookeeper version string

[Jerry He]

Hi,

I am building Zookeeper with a customized version
string: version=3.4.6_IBM_1.
I am getting build error:

     [java] Executing
'/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64/jre/bin/java' with
arguments:
     [java] '-classpath'
     [java] '/home/bigdata/zookeeper/build/classes'
     [java] 'org.apache.zookeeper.version.util.VerGen'
     [java] '3.4.6_IBM_1'
     [java] ''
     [java] '02/20/2015 02:50 GMT'
     [java]
     [java] The ' characters around the executable and arguments are
     [java] not part of the command.
     [java] Invalid version number format, must be "x.y.z(-.*)?"

Looking at the VerGen code, it expects the version string to match the
shown pattern.

I wonder if there is any particular reason for this limitation.  Can this
be relaxed?

Thanks,

Jerry