Breakpad's symupload needs -ldl.

breakpad/breakpad.gyp

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../build/common.gypi',
   ],
   'conditions': [
     [ 'OS=="mac"', {
@@ skipping 280 matching lines @@
 #          'type': 'executable',
 #
 #          'sources': [
 #            'src/tools/linux/symupload/sym_upload.cc',
 #            'src/common/linux/http_upload.cc',
 #          ],
 #
 #          'include_dirs': [
 #            'src',
 #          ],
+#         'link_settings': {
+#            'libraries': [
+#              '-ldl',
+#            ],
+#          },
 #        },
 #        {
 #          'target_name': 'dump_syms',
 #          'type': 'executable',
 #
 #          'sources': [
 #            'src/tools/linux/dump_syms/dump_syms.cc',
 #            'src/common/linux/dump_symbols.cc',
 #            'src/common/linux/file_id.cc',
 #            'src/common/md5.c',
 #          ],
 #
 #          'include_dirs': [
 #            'src',
 #          ],
 #        },
       ],
     }],
   ],
 }