Fix build with system libvpx....

source/ffmpeg.gyp

 # Copyright (c) 2010 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.
 
 # There's a couple key GYP variables that control how FFmpeg is built:
 #   ffmpeg_branding
 #     Controls whether we build the Chromium or Google Chrome version of
 #     FFmpeg.  The Google Chrome version contains additional codecs.
 #     Typical values are Chromium, Chrome, ChromiumOS, and ChromeOS.
 #   use_system_ffmpeg
@@ skipping 880 matching lines @@
           'conditions': [
             # Linux/Solaris need libdl for dlopen() and friends.
             ['OS=="linux" or OS=="solaris"', {
               'link_settings': {
                 'libraries': [
                   '-ldl',
                 ],
               },
             }],
 
+            ['use_system_vpx!=0', {
+              'direct_dependent_settings': {
+                'link_settings': {
+                  'libraries': [
+                    '-lvpx',

[scherkus (not reviewing), 2010/11/22 07:17:34]

hmm so we already include -lpvx but that's when use_system_ffmpeg!=0 (see line
415 or so) and we have a section for checking use_system_vpx up there as well

I'm a bit confused as to what this section is accomplishing... when using both
the system ffmpeg *and* the system libvpx?

if that's the case, isn't the system ffmpeg sufficient assuming that it was
built with libvpx?

[fbarchard1, 2010/11/22 20:57:04]

We need -lvpx if building ffmpeg.

+                  ],
+                },
+              },
+            }],
+
             # Add pkg-config result to include path when use_system_ffmpeg!=0
             ['use_system_ffmpeg!=0', {
               'cflags': [
                 '<!@(pkg-config --cflags libavcodec libavformat libavutil)',
               ],
               'direct_dependent_settings': {
                 'cflags': [
                   '<!@(pkg-config --cflags libavcodec libavformat libavutil)',
                 ],
               },
@@ skipping 21 matching lines @@
       ],  # conditions
     },
   ],  # targets
 }
 
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