touch: Always expect XInput2 availability.

build/linux/system.gyp

 # Copyright (c) 2011 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.
 
 {
   'conditions': [
     ['sysroot!=""', {
       'variables': {
         'pkg-config': './pkg-config-wrapper "<(sysroot)"',
       },
@@ skipping 247 matching lines @@
           },
           'link_settings': {
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other x11)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l x11)',
             ],
           },
       }],
-      # When XInput2 is available (i.e. inputproto version is 2.0), the
-      # pkg-config command will succeed, so the output will be empty.
-      ['"<!@(<(pkg-config) --atleast-version=2.0 inputproto || echo $?)"==""', {
-        'direct_dependent_settings': {
-          'defines': [
-            'HAVE_XINPUT2',

[Yusuke Sato, 2011/06/06 01:08:38]

http://src.chromium.org/viewvc/chrome?view=rev&revision=87756 also uses
HAVE_XINPUT2 (to work around crbug.com/84694). Could you keep HAVE_XINPUT2 for a
while until crbug.com/84694 gets fixed?

-          ],
-        },
+      ['touchui==1', {
         'link_settings': {
           'ldflags': [
             '<!@(<(pkg-config) --libs-only-L --libs-only-other xi)',
           ],
           'libraries': [
             '<!@(<(pkg-config) --libs-only-l xi)',
           ],
         }
       }],
       ],
@@ skipping 138 matching lines @@
       ],
     },
   ],
 }
 
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