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For complete putenv()-like behaviour. Further investigation on why putenv() caused EFAULTs on execve() and segfaults on reload: putenv(3): "The string pointed to by string becomes part of the environment, so altering the string changes the environment." setenv(3): "This function makes copies of the strings pointed to by name and value (by contrast with putenv(3))." Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>