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--with-gnome=<version> flag with ./autogen.sh.base-devel group installed.gsettings set com.canonical.desktop.interface scrollbar-mode normal.gnome-themes-standard installed.Details:
When running ./autogen.sh --prefix=/usr I get the following error:
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/bin/autoconf --force
configure:2699: error: possibly undefined macro: AC_MSG_ERROR
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1
As this is the first time I am building anything from source, I am a bit lost as to how I resolve the issue. Any help is greatly appreciated.
You're missing the pkg-config package. Have a second look at the README.md and install it along with the other dependencies.
Thanks horst3180. That fixed the issue. I have selected the arc theme, but I no longer have window buttons, see screenshot. Am I missing something else!!

Experienced the same (no buttons), seems a permission issue here with me.
->
cd /usr/share/themes
sudo chmod u=rwx,g=rx,o=rx Arc -R
sudo chmod u=rwx,g=rx,o=rx Arc-Dark -R
sudo chmod u=rwx,g=rx,o=rx Arc-Darker -R
Thanks dnz16. I had to log off before I had the buttons after issuing those commands. Though now I seem to have different style buttons on different windows. See screenshot.

Thanks @dnz16, I didn't know that one can just set parameters using _comma sign_ for chmod command in such a way.
See here https://github.com/horst3180/arc-theme/issues/522.
tl;dr... Gnome is broken in Debian Testing. Half of the Gnome packages in Testing are still version 3.18.
Thanks horst3180, explains a lot ;-)
Most helpful comment
See here https://github.com/horst3180/arc-theme/issues/522.
tl;dr... Gnome is broken in Debian Testing. Half of the Gnome packages in Testing are still version 3.18.