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  next if (!$found_libs->{$key});
  $DEFS .= " -DHAVE_$key";
  print "    $key = '$found_libs->{$key}'\n" if ($verbose);
}

# Configure MakeMaker
my($LIBS,$OPTS,$CLEAN,$LDFROM);
my $EXES = [];
my $DYNS = {};
if ($IS_W32API || (($^O eq 'MSWin32') && !$IS_CYGWIN))		# Win32
{
  my $glut_lib = '-lopengl32 -lglu32 ';
  if ($interface_lib eq 'GLUT')
  {
    $glut_lib .= '-lglut32';
  }
  elsif ($interface_lib eq 'FREEGLUT' and $IS_STRAWBERRY)
  {
    $glut_lib .= '-lglut';
  }
  else
  {
    $glut_lib .= '-LFreeGLUT -lfreeglut';
  }

  if ($IS_MINGW)	# MINGW
  {
    $LDFROM = $glut_lib;
  }
  elsif ($IS_W32API)	# CYGWIN W32API
  {
     my $glut = ($found_libs->{FREEGLUT32}) ? $found_libs->{FREEGLUT32} : $found_libs->{GLUT32};

    $LIBS = "-L/usr/lib/w32api $glut_lib";
    $LDFROM = $glut_lib;
    ### $INCS = '-I/usr/include/w32api';
    $INCS = '-I/usr/include/opengl';
    $DEFS .= " -DHAVE_W32API";
    $DYNS = { OTHERLDFLAGS => '-Wl,--exclude-symbols,'."\x7F".$glut.'_NULL_THUNK_DATA' };
  }
  else			# Windows VC6
  {
    $LIBS = $glut_lib;
    $OPTS = "/ogity /GDs";
  }

  # Using a dll as EXES is incorrect for EU::MM, since the EXES here mean
  # perl scripts and not windows binaries or DLLs.  This puts the DLL in
  # blib/bin from whence it should be installed correctly.  It is not
  # clear that this step is even needed since the freeglut.dll is installed
  # by this Makefile.PL if no FreeGLUT is found.
  #
  ## $EXES = ['FreeGLUT/freeglut.dll'];
  {
     system $^X , qw[-MExtUtils::Command -e mkpath --], qw[blib/arch/auto/Acme/MITHALDU/BleedingOpenGL];
     system $^X , qw[-MExtUtils::Command -e cp --], qw[FreeGLUT/freeglut.dll blib/arch/auto/Acme/MITHALDU/BleedingOpenGL/freeglut.dll];
     my @other_installs = grep { -e "$_\\freeglut.dll" } split /;/, $ENV{PATH};
     if(@other_installs) {
      print "\n" ;
      print "XXX Other freeglut.dll installed in $_\n" for @other_installs;
      print "Please verify whether the other found dll(s) are from older OpenGL.pm installs, and delete them if so!\n\n\n";
      sleep 2;
     }
  }

}
elsif ($interface_lib eq 'AGL')					# Mac OS X
{
  $INCS = ""; # no include flags required: Apple gcc will automatically pick up the system frameworks
  $DEFS .= " -DHAVE_AGL_GLUT -Wno-deprecated-declarations ";  # So we know we have glutWMCloseFunc() and glutCheckLoop()
  $DYNS = { OTHERLDFLAGS => "-framework OpenGL -framework GLUT" };
}
else # Everyone else
{
  my @includes = qw
  {
    -I/usr/include
    -I/usr/include
    -I/usr/X11R6/include
    -I/opt/X11/include
    -I/usr/local/include
    -I/usr/openwin/include
    -I/opt/csw/include
    -I/usr/local/freeglut/include
  };
  $INCS = "@includes";


  # Test for obfuscated GLX
  # quite often GLX is in -lGL...  Test for GL/glx.h instead...
  my $out = cfile_text('GL/glx.h');

  # The cpp would not let this macro through. Check for something else
  # that still exists after the cpp pass. a typedef, or type would work
  my $has_glx = ($out =~ m|GLXContext|);

  if ($has_glx)
  {
    #delete($found_libs->{GLX});
    $DEFS .= " -DHAVE_GLX";
  }
  elsif (!$found_libs->{GLX} && $verbose)
  {
    print "GLX not found (neither library, nor headers).";
  }

  # Test for obfuscated Freeglut
  # quite often Freeglut is in -lglut...  Test for GL/freeglut.h instead...
  $out = cfile_text('GL/freeglut.h');

  # The cpp would not let this macro through. Check for something else
  # that still exists after the cpp pass. a typedef, or type would work
  my $has_freeglut = ($out =~ m|glutMainLoopEvent|);

  if ($has_freeglut)
  {
    #delete($found_libs->{GLX});
    $DEFS .= " -DHAVE_FREEGLUT -DHAVE_FREEGLUT_H";
    $found_libs->{FREEGLUT}="glut";
  }