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diff --git "a/D:\\Gleb\\chromiumembedded-cef-f061c231e6a9\\chromiumembedded-cef-f061c231e6a9\\tools\\make_version_header.py" "b/C:\\Users\\clarityad\\Desktop\\Gleb\\patches\\cef\\tools\\make_version_header.py"
index d6d6bd2..9c6dbd6 100644
--- "a/D:\\Gleb\\chromiumembedded-cef-f061c231e6a9\\chromiumembedded-cef-f061c231e6a9\\tools\\make_version_header.py"
+++ "b/C:\\Users\\clarityad\\Desktop\\Gleb\\patches\\cef\\tools\\make_version_header.py"
@@ -58,7 +58,6 @@ if options.header is None or options.cef_version is None or options.chrome_versi
 def write_version_header(header, chrome_version, cef_version, cpp_header_dir):
   """ Creates the header file for the current revision and Chrome version information
        if the information has changed or if the file doesn't already exist. """
-
   if not path_exists(chrome_version):
     raise Exception('Chrome version file ' + chrome_version +
                     ' does not exist.')
@@ -76,11 +75,20 @@ def write_version_header(header, chrome_version, cef_version, cpp_header_dir):
 
   year = get_year()
 
-  if not git.is_checkout('.'):
-    raise Exception('Not a valid checkout')
-
-  commit_number = git.get_commit_number()
-  commit_hash = git.get_hash()
+  commit_number = None
+  commit_hash = None
+  assumed_commit_number = os.environ.get('CEF_GIT_ASSUME_COMMIT_NUMBER')
+  assumed_hash = os.environ.get('CEF_GIT_ASSUME_HASH')
+  if assumed_commit_number is None:
+    assert assumed_hash is None, 'When environment variable CEF_GIT_ASSUME_COMMIT_NUMBER is not set then environment variable CEF_GIT_ASSUME_HASH must not be set'
+    if not git.is_checkout('.'):
+      raise Exception('Not a valid checkout')
+    commit_number = git.get_commit_number()
+    commit_hash = git.get_hash()
+  else:
+    assert assumed_hash is not None, 'When environment variable CEF_GIT_ASSUME_COMMIT_NUMBER is set then environment variable CEF_GIT_ASSUME_HASH must be set'
+    commit_number = assumed_commit_number
+    commit_hash = assumed_hash
   version = '%s.%s.%s.g%s' % (args['CEF_MAJOR'], args['BUILD'], commit_number,
                               commit_hash[:7])