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From: Yuri D'Elia <wavexx@thregr.org>
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Subject: master b9ac4f8.. (Fix locating pdump by symlink) breaks with stow
Date: Mon, 24 Jun 2019 12:26:00 +0200
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% which emacs
/usr/local/bin/emacs
% ls -l =emacs
/usr/local/bin/emacs -> ../stow/emacs-20190624/bin/emacs
% emacs
emacs: could not resolve realpath of "(null)": No such file or directory

reverting commit b9ac4f815ebaa1acb0d045fe9583f665efa6f628 fixes the
issue.