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	'PNDRIV' => 'png',
	'AQDRIV' => 'aquaterm',
    );

    while (<$fh>) {
	next if /^\s*$/ or /^!/;  # /; (comment is to un-confuse emacs highlighting)
	chomp;
	my @words = split;
	if ( exists $libs{$words[0]} ) {
	    $retval .= " -l" . $libs{$words[0]};
	    delete $libs{$words[0]}; # since the driver can appear multiple times in drivers.list
	}
    }
    $fh->close;

    return $retval;

} # sub: find_required_driver_libs()

# What os are we using?
#
my $is_vms   = $^O eq "VMS";
my $is_osx   = $^O eq "darwin";
my $is_win32 = $^O =~ /mswin32/i;

# Move the logic out of the WriteMakefile statement to make it a
# bit easier to follow. We use the %items hash to store key,value
# pairs that will be used in the WriteMakefile call. Note that
# some key settings are platform specific.
#
my %items;

$items{DEFINE} = "-DNO_TRAILING_USCORE"
    unless ExtUtils::F77->trail_;

$items{DLEXT} = "xs.dll" if $is_win32;

if ( $is_vms ) {
    $items{INC}  = 'pgplot_dir:';
    $items{LIBS} = 'pgplot_dir:cpgplot.olb';
} else {

    $items{INC} = $IDIRS;

    $items{OBJECT} = '$(BASEEXT)$(OBJ_EXT) pgplot_tmp/libcpgplot.a ' .
	'pgplot_tmp/libpgplot.a'
	if -d 'pgplot_tmp';

    $items{LIBS} = [ join( ' ', $LIBDIRS, $LIBS, ExtUtils::F77->runtime ) ];

    # This is not ideal since it assumes that:
    #    objc is required
    #    the logic in find_required_driver_libs() is correct
    #    the libraries are located either in a location pointed to by LDFLAGS
    #       or in /sw/lib
    #
    if ($is_osx) {
	my $pgplot_dir = defined $ENV{PGPLOT_DIR} ? $ENV{PGPLOT_DIR} : "/usr/lib";
	my $dir = -d 'pgplot_tmp' ? 'pgplot_tmp' : $pgplot_dir;
	$items{LIBS}[0] .= " -lobjc " .
	    (defined $ENV{LDFLAGS} ? $ENV{LDFLAGS} : "-L/sw/lib") .
	    find_required_driver_libs($pgplot_dir);
    }

    # The following is needed for PGPLOT compiled on OS-X, at least
    # for both the version used from FINK and a hand-compiled version.
    #
    $items{LDDLFLAGS} = "$Config{lddlflags} -Wl,-framework -Wl,Foundation"
	if $is_osx;
 
    # Nasty hack to build only i386/x86_64 only instead of a Universal binary on OS X
    # I put this in to avoid an error if linking with the pgplot libs in 
    # SciKarl (2.4.6 and above). Hope one day to remove this.
    # - Karl Glazebrook
    if ($is_osx) {
       
       $items{CCFLAGS} = $Config{ccflags};
       $items{LDFLAGS} = $Config{ldflags};
       $items{LDDLFLAGS} = $Config{lddlflags};
       
       # Added this 11/1/2021 to avoid warnings about 'compact unwinds' on MacOS11
       my @darwin_vers = split("\\.",$Config{osvers});  # Darwin version XX.YY.ZZ
       if ($darwin_vers[0]>=20) { # Big Sur
          $items{LDDLFLAGS} .= "  -Wl,-no_compact_unwind"; # Avoid mess of warnings about this
       }

       # Karl - now figure out automagically WHICH binary arch
       # to build for and change the various flags
       
       mac_universal( \$items{CCFLAGS}, \$items{LDFLAGS}, \$items{LDDLFLAGS});
       print "TEST $items{CCFLAGS}\n";
       print "TEST $items{LDFLAGS}\n";
       print "TEST $items{LDDLFLAGS}\n";

  
    }   

}

my @prereq;
my %min_version = (
  'PDL' => '2.089', # broadcast_define, no PGPLOT
);
for my $opt_dep (sort keys %min_version) {
  (my $file = $opt_dep) =~ s#::#/#g;
  next if !eval { require "$file.pm"; 1 }; # not installed, fine
  next if eval { $opt_dep->VERSION($min_version{$opt_dep}); 1 };
  push @prereq, $opt_dep => $min_version{$opt_dep};
}

WriteMakefile(
    'NAME'	=> 'PGPLOT',
    MIN_PERL_VERSION => '5.010001',
    'CONFIGURE_REQUIRES' => { 'ExtUtils::F77' => 1.13, 'Devel::CheckLib' => '1.14' },
    'TEST_REQUIRES' => { 'Test::More' => '0.88' },
    PREREQ_PM => { @prereq },
    'VERSION_FROM'	=> 'lib/PGPLOT.pm',
    'dist'      => { COMPRESS=>"gzip", SUFFIX=>"gz" },
    'depend'    => { '$(OBJECT)' => q[pgfun.c arrays.c PGPLOT.c]},
    'META_MERGE' => {
       "meta-spec" => { version => 2 },