Update the gyp Linux build:

webkit/webkit.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.
 
 {
   'variables': {
     'feature_defines': [
       'ENABLE_DATABASE=1',
       'ENABLE_DASHBOARD_SUPPORT=0',
       'ENABLE_JAVASCRIPT_DEBUGGER=0',
@@ skipping 3924 matching lines @@
         4138, 4244, 4291, 4305, 4344, 4355, 4521, 4099,
       ],
       'xcode_settings': {
         # Some Mac-specific parts of WebKit won't compile without having this
         # prefix header injected.
         # TODO(mark): make this a first-class setting.
         'GCC_PREFIX_HEADER': '../third_party/WebKit/WebCore/WebCorePrefix.h',
       },
       'conditions': [
         ['OS=="linux"', {
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
           'sources!': [
             # Not yet ported to Linux.
             '../third_party/WebKit/WebCore/platform/graphics/chromium/FontCustomPlatformData.cpp',
           ],
           'sources/': [
             # Cherry-pick files excluded by the broader regular expressions above.
             ['include', 'third_party/WebKit/WebCore/platform/chromium/KeyCodeConversionGtk\\.cpp$'],
             ['include', 'third_party/WebKit/WebCore/platform/graphics/chromium/FontCacheLinux\\.cpp$'],
             ['include', 'third_party/WebKit/WebCore/platform/graphics/chromium/FontLinux\\.cpp$'],
             ['include', 'third_party/WebKit/WebCore/platform/graphics/chromium/FontPlatformDataLinux\\.cpp$'],
             ['include', 'third_party/WebKit/WebCore/platform/graphics/chromium/GlyphPageTreeNodeLinux\\.cpp$'],
             ['include', 'third_party/WebKit/WebCore/platform/graphics/chromium/SimpleFontDataLinux\\.cpp$'],
           ],
-          # for:
-          #   .../WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp
-          'cflags': ['-Wno-multichar'],
+          'cflags': [
+            # -Wno-multichar for:
+            #   .../WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp
+            '-Wno-multichar',
+          ],
           # TODO(sgk):  unnecessary once common.gypi gets Linux settings
           # necessary to avoid build failure due to warnings generated by:
           #   ../third_party/WebKit/WebCore/dom/Document.cpp
           'scons_remove' : {'CXXFLAGS' : ['-Werror']},
         }],
         ['OS=="mac"', {
           'actions': [
             {
               # Allow framework-style #include of
               # <WebCore/WebCoreSystemInterface.h>.
@@ skipping 141 matching lines @@
         '../third_party/WebKit/WebKit/chromium/src/ChromiumCurrentTime.cpp',
         '../third_party/WebKit/WebKit/chromium/src/ChromiumThreading.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebCache.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebCString.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebImageSkia.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebKit.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebString.cpp',
         '../third_party/WebKit/WebKit/chromium/src/WebURL.cpp',
       ],
       'conditions': [
+        ['OS=="linux"', {
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
+        }],
         ['OS=="mac"', {
           'sources!': [
             '../third_party/WebKit/WebKit/chromium/src/WebImageSkia.cpp',
           ],
         }],
         ['OS=="win"', {
           'sources': [
             '../third_party/WebKit/WebKit/chromium/public/win/WebSandboxSupport.h',
             '../third_party/WebKit/WebKit/chromium/public/win/WebThemeEngine.h',
           ],
@@ skipping 272 matching lines @@
       ],
       # When glue is a dependency, it needs to be a hard dependency.
       # Dependents may rely on files generated by this target or one of its
       # own hard dependencies.
       'hard_dependency': 1,
       'export_dependent_settings': [
         'webcore',
       ],
       'conditions': [
         ['OS=="linux"', {
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+            '../build/linux/system.gyp:pangoft2',
+          ],
           'sources!': [
             'glue/plugins/plugin_stubs.cc',
           ],
         }, { # else: OS!="linux"
           'sources/': [['exclude', '_(linux|gtk)(_data)?\\.cc$']],
         }],
         ['OS!="mac"', {
           'sources/': [['exclude', '_mac\\.(cc|mm)$']]
         }],
         ['OS!="win"', {
@@ skipping 21 matching lines @@
             'default_plugin/default_plugin.gyp:default_plugin',
           ],
           'sources!': [
             'glue/plugins/plugin_stubs.cc',
           ],
         }],
       ],
     },
   ],
 }