I can't open info manuals in an Emacs freshly installed in my GNU system
installed in a real machine using the ISO installer
(https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).
## Steps to reproduce
1. guix install emacs
2. Start Emacs.
3. M-x info Enter.
4. m Guix Enter (or any other manual).
## Unexpected result
The manual is not displayed, and the minibuffer says:
Uncompression program 'sh' not found
## Expected result
The Guix manual is displayed.
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https://sirgazil.bitbucket.io/
