Hello,

I have Guix 0.5 installed on a fedora 14, 2.6.32 kernel.

Running the following:
guix package --verbose -i tar

I get the error:
guix package: error: build failed: unable to fork: Operation not permitted

I traced the error to the clone() operation in build.cc. As mentioned by
Ludovic in a previous conversation with Matthias Wachs, it seems to be a
problem of a missing capability CAP_SYS_ADMIN.
I tried running the daemon as root only or with
--build-users-group=guix-builder but I get the same error. I also tried
isolating the clone operation in a test script to verify the problem, fails
again (running as root).

I tried removing all the CLONE_* flags as recommended by Ludovic, I get the
error:
build error: cannot set loopback interface flags: Permission denied

I assume its because of the missing CLONE_NEWNET

It seems that for some reason on this system, processes started with root
privileges does not get the CAP_SYS_ADMIN capability. I know this is more
of an environment problem than a Guix problem but I was hoping if you guys
have any pointers as what could be the issue.

Thanks a lot,
Omar