Compile rtc_api_objc on Mac.

webrtc/api/api.gyp

Index: webrtc/api/api.gyp
diff --git a/webrtc/api/api.gyp b/webrtc/api/api.gyp
index c9add179feaa5384f6f52f8e4df3aa5d07fd627f..4fe8ce845884faf8014450b9431e77a9ef45b03b 100644
--- a/webrtc/api/api.gyp
+++ b/webrtc/api/api.gyp
@@ -122,19 +122,19 @@
         }, # libjingle_peerconnection_java
       ]
     }],
-    ['OS=="ios"', {
+    ['OS=="ios" or (OS=="mac" and mac_deployment_target=="10.7")', {
       'targets': [
         {
           'target_name': 'rtc_api_objc',
           'type': 'static_library',
+          'includes': [
+            '../build/objc_common.gypi',
+          ],
           'dependencies': [
             '<(webrtc_root)/base/base.gyp:rtc_base_objc',
             'libjingle_peerconnection',
           ],
           'sources': [
-            'objc/RTCAVFoundationVideoSource+Private.h',
-            'objc/RTCAVFoundationVideoSource.h',
-            'objc/RTCAVFoundationVideoSource.mm',
             'objc/RTCAudioTrack+Private.h',
             'objc/RTCAudioTrack.h',
             'objc/RTCAudioTrack.mm',
@@ -191,14 +191,17 @@
             'objc/RTCVideoTrack+Private.h',
             'objc/RTCVideoTrack.h',
             'objc/RTCVideoTrack.mm',
-            'objc/avfoundationvideocapturer.h',
-            'objc/avfoundationvideocapturer.mm',
           ],
           'conditions': [
             ['OS=="ios"', {
               'sources': [
+                'objc/RTCAVFoundationVideoSource+Private.h',
+                'objc/RTCAVFoundationVideoSource.h',
+                'objc/RTCAVFoundationVideoSource.mm',
                 'objc/RTCEAGLVideoView.h',
                 'objc/RTCEAGLVideoView.m',
+                'objc/avfoundationvideocapturer.h',
+                'objc/avfoundationvideocapturer.mm',
               ],
               'all_dependent_settings': {
                 'xcode_settings': {
@@ -228,11 +231,6 @@
               ],
             }],
           ],
-          'xcode_settings': {
-            'CLANG_ENABLE_OBJC_ARC': 'YES',
-            'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
-            'GCC_PREFIX_HEADER': 'objc/WebRTC-Prefix.pch',
-          },
         }
       ],
     }],  # OS=="ios"