Fusermount build when enabled with --enable-fusermount during GlusterFS compilation fails for CLONE_NEWNS. Fix should be by passing -D_GNU_SOURCE for CFLAGS.
CHANGE: http://review.gluster.com/692 (Change-Id: Id25e688d3dbecb74d820388faec5ee5041f21630) merged in release-3.2 by Anand Avati (avati)
CHANGE: http://review.gluster.com/714 (Change-Id: Id25e688d3dbecb74d820388faec5ee5041f21630) merged in master by Anand Avati (avati)