Get the OpenGLUI emulator building again on the desktop. Mostly this is applying the changes here:

samples/sample_extension/sample_extension.gyp

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'sample_extension',
       'type': 'shared_library',
       'dependencies': [
@@ skipping 16 matching lines @@
               'AdditionalDependencies': [ 'dart.lib' ],
               'AdditionalLibraryDirectories': [ '<(PRODUCT_DIR)' ],
             },
           },
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'OTHER_LDFLAGS': [ '-undefined', 'dynamic_lookup' ],
           },
         }],
+        ['OS=="linux"', {
+          'cflags': [
+            '-fPIC',
+          ],
+        }],
       ],
     },
   ],
 }