Building Icedove from git

[Ralf Mardorf <ralf.mardorf@alice-dsl.net>]

Hi :)

I try to build Icedove for Arch Linux x86_64, but autoconf fails with

        mozilla/build/autoconf/acwinpaths.m4:10: error: defn: undefined
        macro: AC_OUTPUT_FILES
        mozilla/build/autoconf/acwinpaths.m4:10: the top level
        autom4te: /usr/bin/m4 failed with exit status: 1
        
The version of Debian Sid's and Arch's autoconf from their repositories
are equal, autoconf 2.69.

$ git log --pretty=format:"%h" | head -1
7fa36d6

Any hints are welcome. I know that there is Thunderbird available for
Arch, but I won't use Thunderbird, I even won't use Icedove, I just want
to test something and want to get Icedove for Arch, instead of rebooting
to Debian or installing it to Vbox, just to make some tests.

Regards,
Ralf