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When the DPDK_GETMAINTAINER_PATH variable was not set, the error message from get-maintainer.sh was quite cheap: $ devtools/get-maintainer.sh --help usage: get-maintainer.sh <patch> Cannot execute DPDK_GETMAINTAINER_PATH Add a more detailed explanation about this variable in the help. Signed-off-by: Olivier Matz <olivier.matz@6wind.com> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>