[Libvirt-ci] Build failed in Jenkins: libvirt-build » libvirt-fedora-28 #1

See <https://ci.centos.org/job/libvirt-build/systems=libvirt-fedora-28/1/display/redirect>

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Started by upstream project "libvirt-build" build number 1
originally caused by:
 Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on libvirt-fedora-28 (libvirt) in workspace <https://ci.centos.org/job/libvirt-build/systems=libvirt-fedora-28/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/libvirt/libvirt.git # timeout=10
Fetching upstream changes from https://github.com/libvirt/libvirt.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/libvirt/libvirt.git +refs/heads/*:refs/remotes/origin/*
Checking out Revision 65a547aa8e6362c0f37f873bd7d03ebdbb5c4be2 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 65a547aa8e6362c0f37f873bd7d03ebdbb5c4be2
Commit message: "qemuBuildMemPathStr: Produce -mem-path more frequently"
First time build. Skipping changelog.
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
[libvirt] $ /bin/sh -xe /tmp/jenkins6642894841557215523.sh
+ mkdir build
mkdir: cannot create directory ‘build’: File exists
Build step 'Execute shell' marked build as failure