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Jehan authored
glib's g_getenv() doc says: "The returned string may be overwritten by the next call to g_getenv(), g_setenv() or g_unsetenv()". And I do g_setenv() calls just after, while I wish to keep the value intact. As a consequence, even though the previous commit seemed to work just fine, I duplicate the return value of g_getenv(), just to be on the safe side.
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