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Some perl packages may use environment variables as a hint to know how to be configured. That's for example the case for perl-net-ssleay that uses OPENSSL_PREFIX, if it is set in the environment, as the prefix to openssl. Add a new variable that packages can set if they need extra environment variables. Update the manual accordingly. Signed-off-by: Francois Perrad <francois.perrad@gadz.org> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr> [yann.morin.1998@free.fr: enhance the commit log] Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>