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This is a requirement for the code in libxl_remus_disk_drbd.c that uses the ioctl syscall. Fixes the following error when building on FreeBSD: libxl_remus_disk_drbd.c: In function 'drbd_postsuspend': libxl_remus_disk_drbd.c:197:9: error: implicit declaration of function 'ioctl' [-Werror=implicit-function-declaration] Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Yang Hongyang <yanghy@cn.fujitsu.com> Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>