May I please request that you supply a newer version of the `autoconf' tools, at least the one that supports the AX_CXX_COMPILE_STDCXX_11 macro: https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html If so, I will submit a change request via the OSDN website. (Should I have done so wihtout bothering the mailing list?) -- () ascii ribbon campaign -- against html e-mail /\ http://preview.tinyurl.com/qcy6mjc [archived]