On Tue, 14 Mar 2017, Michael Albinus wrote:

> I've followed your recipe exactly. The emacs is the recent one:
>
> --8<---------------cut here---------------start------------->8---
> C-h C-a
> GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.20.9)
> of 2017-03-14
>
> M-& which emacs
> /home/albinmic/bin/emacs
>
> M-& ls -l `which emacs`
> lrwxrwxrwx 1 albinmic albinmic 34 Mär 14 09:36 /home/albinmic/bin/emacs -> /home/albinmic/src/emacs/src/emacs
>
> M-& ls -l /home/albinmic/src/emacs/src/emacs
> -rwxrwxr-x 3 albinmic albinmic 56720584 Mär 14 08:43 /home/albinmic/src/emacs/src/emacs
>
> M-& emacs -Q
> --8<---------------cut here---------------end--------------->8---
>
> It comes up. So I don't know why it doesn't work for you :-(
It might be because i don't use a stable release of Debian.  I update
it mostly every day.

Thank you.  Your receipt looks identical:

M-& which emacs
/home/calancha/bin/emacs

M-& ls -l `which emacs`
lrwxrwxrwx 1 calancha calancha 42 Mar 14 11:11 /home/calancha/bin/emacs -> /home/calancha/soft/emacs-master/src/emacs
M-& emacs -Q

I see following error in *Async Shell Command*:
(maybe someone suspect something)

Warning: arch-dependent data dir '/usr/local/libexec/emacs/26.0.50/x86_64-pc-linux-gnu/': No such file or directory
Warning: Lisp directory '/usr/local/share/emacs/26.0.50/lisp': No such file or directory
Warning: Could not find simple.el or simple.elc
Gtk-Message: Failed to load module "pk-gtk-module"
Gtk-Message: Failed to load module "pk-gtk-module"

The new Emacs instance shows the *scratch* buffer and the error:
Cannot open load file: No such file or directory, mule-util

Following also works fine.
M-& which ~/bin/emacs -Q

If i checkout the commit right before yours, that is
f591765e2b6b9ec3fa3ff647c77a10c984f78133
i don't reproduce the issue.