I’m trying out this simple C program
[https://www.gnu.org/software/guile/manual/guile.html#Linking-Guile-into-Programs]
that uses libguile. The hostname on my distro is called “guix”, but for some
reason, it shows #f, which I’m assuming is the boolean value “false”, when I
build and run the program ...
Curiously, I can reproduce this on my Guix System, but actually not on my Fedora system (where it is exported automatically), so I guess some distros choose to explicitly export the HOSTNAME variable?