LGTM
https://codereview.appspot.com/573270043/diff/549210045/configure.ac File configure.ac (right): https://codereview.appspot.com/573270043/diff/549210045/configure.ac#newcode212 configure.ac:212: # options. Unfortunately GCC doesn't support this options, so we just s/options/option/ And please use two spaces after a sentence stop. https://codereview.appspot.com/573270043/
