-$DM_PHP $DM_SOURCEDIR/distmaker/utils/joomlaxml.php $DM_SOURCEDIR com_civicrm $DM_VERSION zip
-$DM_ZIP -q -r -9 com_civicrm/admin/civicrm.zip civicrm
-$DM_ZIP -q -r -9 $DM_TARGETDIR/civicrm-$DM_VERSION-joomla.zip com_civicrm -x 'com_civicrm/admin/civicrm'
+${DM_PHP:-php} $DM_SOURCEDIR/distmaker/utils/joomlaxml.php $DM_SOURCEDIR com_civicrm $DM_VERSION zip
+${DM_ZIP:-zip} -q -r -9 com_civicrm/admin/civicrm.zip civicrm
+${DM_ZIP:-zip} -q -r -9 $DM_TARGETDIR/civicrm-$DM_VERSION-joomla.zip com_civicrm -x 'com_civicrm/admin/civicrm'