Explicitly declare the environ variable
#306
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While glibc includes a declaration of `environ` within `unistd.h`, this is not always the case for other libc instances; POSIX states that `environ` "must be declared by the user if it is to be used directly"¹. This fixes a build failure on FreeBSD reported at LubosD#305 (comment) ¹ https://pubs.opengroup.org/onlinepubs/9699919799/
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While glibc includes a declaration of
environwithinunistd.h, this is not always the case for other libc instances; POSIX states thatenviron"must be declared by the user if it is to be used directly"¹.This fixes a build failure on FreeBSD reported at
#305 (comment)
¹ https://pubs.opengroup.org/onlinepubs/9699919799/