sub expand_bash_var {
  my ($varhash, $dephash, $queue) = @_;

  $queue ||= [ keys %$varhash ];

  # for each item in the queue
  for (@$queue) {

    # make sure its dependencies are expanded
    expand_bash_var($varhash, $dephash, $dephash->{$_});

    # then interpolate the variables in this item
    $varhash->{$_} =~ s/\$\{?(\w+)\}?/$varhash->{$1}/g;
  }
}

sub get_depend {
  my $ebuildfname = shift;
  my $ebuildcontents;
  my %ebuildvars;
  my $pkgname = $ebuildfname;
  my %vardepend;

#  print "Getting depend for '$ebuildfname'\n";
  $pkgname =~ s|/usr/portage/||;
  $pkgname =~ s|(.+)/.+/(.+).ebuild|$1/$2|;
  my $pkg = parse_package_name($pkgname);
  $pkg->{version} =~ s/^-//;
  $ebuildvars{PV} = "$pkg->{version}$pkg->{suffix}";

  open EBUILD, "< $ebuildfname" or die "Couldn't open '$ebuildfname' to get DEPEND\n";
  while(<EBUILD>) {
    $ebuildcontents .= $_;
  }
  close EBUILD;

  while($ebuildcontents =~ /\b([-A-Z0-9_]+)\s*=\s*\"(.*?)\"/sgc) {
    $ebuildvars{$1} = $2;
  }
  print "Calling expand_bash_var() for '$ebuildfname'\n";
  expand_bash_var(\%ebuildvars, \%vardepend);
  print "Done with expand_bash_var() for '$ebuildfname'\n";

  my $depend = $ebuildvars{'DEPEND'} || '';
  $depend .= " $ebuildvars{'RDEPEND'}" if(defined $ebuildvars{'RDEPEND'});
  $depend =~ s/(\s+|\n+)/ /gs;
  print "$depend\n";

  return $depend;
}