#20 autogen.sh gives misleading error when automake is not installed

[林博仁(Buo-ren Lin)]

I'm trying to build GtkSpell from source in a clean Ubuntu container and notices that the autogen script gives the following error message when GNU Automake(aclocal command to be specific) isn't available:

**Error**: You must have the `ax_cxx_compile_stdcxx_11.m4' macro installed-
Download the appropriate package for your distribution,
or get it from http://mirror.switch.ch/ftp/mirror/gnu/autoconf-archive/

A check for the aclocal command should be implemented to catch this case. Thanks in advance!

[林博仁(Buo-ren Lin)]

Here are some patches that fixes this and some other issues:

[林博仁(Buo-ren Lin)]

A merge request is filed for your convenience.

[Sandro Mani]

Merged, thanks!