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Date: Sun, 07 Jun 2015 17:59:47 +0300
From: "Eli Zaretskii (eliz AT gnu DOT org)" <djgpp AT delorie DOT com>
Subject: Re: Removing GREP_OPTIONS from djgpp.env
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> Date: Thu, 4 Jun 2015 12:38:19 -0700 (PDT)
> From: "rugxulo AT gmail DOT com" <djgpp AT delorie DOT com>
> 
> On a barely related note, can someone give me their opinion on why
> _bhist is always in the root dir?

Because of this:

  static char slash [] = "/";

  struct passwd *
  getpwuid(uid_t uid)
  {
    static struct passwd rv;
    ...
    rv.pw_dir = getenv("HOME");
    if (rv.pw_dir == 0)
      rv.pw_dir = slash;  <<<<<<<<<<<<<<<<<<<<<<

(Bash calls getpwuid when it needs to expand ~/SOMETHING.)