Can distmaker be run off a specific branch
Check the settings in distmaker.conf, the ones at the end. They specify the git branch to pull from:

## Git branch/tag name
DM_REF_CORE=master
DM_REF_DRUPAL=7.x-${DM_REF_CORE}
DM_REF_DRUPAL6=6.x-${DM_REF_CORE}
DM_REF_JOOMLA=${DM_REF_CORE}
DM_REF_WORDPRESS=${DM_REF_CORE}
DM_REF_PACKAGES=${DM_REF_CORE}