zip command is missing on EL6 host

Hi, I submitted a patch to create WildFly RPM with upgraded hibernate-validator [1]. Unfortunately build of this patch is failing on EL6 host [2], because zip command is missing. The zip command is needed during execution of build.sh command (it's not needed during SRPM creation by rpmbui;d, that's why it's not included in BuildRequires). The build finished successfully on EL7 host [3], because zip is present on it. How can this be fixed? Thanks Martin [1] https://gerrit.ovirt.org/40574 [2] http://jenkins.ovirt.org/job/ovirt-engine-wildfly_master_create-rpms-el6-... [3] http://jenkins.ovirt.org/job/ovirt-engine-wildfly_master_create-rpms-el7-...