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  # (presumably if they have set it, they have done so for a reason).
  unless(defined $ENV{PKG_CONFIG_LIBDIR}) {
    @PKG_CONFIG_LIBDIR = qw(
      /usr/local/lib/pkgconfig
      /usr/local/share/pkgconfig
    )
  }

  if( -d '/usr/local/Cellar/openssl' ) {
    require File::Glob;
    my($dir) = File::Glob::bsd_glob('/usr/local/Cellar/openssl/*/lib/pkgconfig');
    push @PKG_CONFIG_LIBDIR, $dir;
  }

  if( -d '/usr/local/Cellar/libressl' ) {
    require File::Glob;
    my($dir) = File::Glob::bsd_glob('/usr/local/Cellar/libressl/*/lib/pkgconfig');
    push @PKG_CONFIG_LIBDIR, $dir;
  }

  if( -l '/opt/local/bin/openssl' ) {
    require Path::Tiny;
    my $dir = Path::Tiny->new(readlink '/opt/local/bin/openssl');
    $dir = $dir->relative('/opt/local/bin') if $dir->is_relative;
    $dir = $dir
      ->parent
      ->parent