Unable to mount remote archives

[tchernobog]

Hallo, I am trying out casync for the first time, both on Debian Testing and Fedora 27, by compiling from sources (from master).

Maybe I am missing something obvious, but on both systems, when I try the following:

./casync make ~/build.catar /home/matteo/Projects/proj/__build__/
mkdir -p mnt && ./casync mount localhost:/home/matteo/build.catar mnt

I always get:

Mounted: mnt
The following feature flags are not exposed in the mounted file system: user-names flag-subvolume flag-subvolume-ro acl selinux fcaps
Failed to seek for stat to /: Operation not supported
Failed to seek for stat to /: Operation not supported
Failed to seek for stat to /: Operation not supported
[last line repeated several times]

Trying to mount the catar locally succeeds without problems. The same happens when using HTTP as a transport, with python -m SimpleHTTPServer as a provider.

Any help would be appreciated.