Description: When building from a source tarball (as opposed to a git checkout) there is no last commit position
Author: Olivier Tilloy <olivier.tilloy@canonical.com>

--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -119,8 +119,6 @@ def main(argv):
     cmd.append('--debug')
   subprocess.check_call(cmd)
 
-  shutil.copy2(
-      os.path.join(BOOTSTRAP_DIR, 'last_commit_position.h'), gn_build_dir)
   subprocess.check_call(
       [ninja_binary, '-C', gn_build_dir, '-w', 'dupbuild=err', 'gn'])
   shutil.copy2(os.path.join(gn_build_dir, 'gn'), gn_path)
--- a/tools/gn/src/gn/gn_main.cc
+++ b/tools/gn/src/gn/gn_main.cc
@@ -16,7 +16,7 @@
 #include "util/msg_loop.h"
 #include "util/sys_info.h"
 
-#include "last_commit_position.h"
+#define LAST_COMMIT_POSITION "UNKNOWN"
 
 namespace {