Need build request "libelf-devel" to build against the latest openSUSE.

Error build message:
============================
[   68s] + umask 022
[   68s] + cd /home/abuild/rpmbuild/BUILD
[   68s] + cd /home/abuild/rpmbuild/BUILD
[   68s] + rm -rf drbd-9.0.9+git.bffac0d9
[   68s] + /usr/bin/bzip2 -dc
/home/abuild/rpmbuild/SOURCES/drbd-9.0.9+git.bffac0d9.tar.bz2
[   68s] + /usr/bin/tar -xof -
[   68s] + STATUS=0
[   68s] + '[' 0 -ne 0 ']'
[   68s] + cd drbd-9.0.9+git.bffac0d9
[   68s] + /usr/bin/chmod -Rf a+rX,u+w,g-w,o-w .
[   68s] + echo 'Patch #1
(fix-resync-finished-with-syncs-have-bits-set.patch):'
[   68s] Patch #1 (fix-resync-finished-with-syncs-have-bits-set.patch):
[   68s] + /usr/bin/patch --no-backup-if-mismatch -p1 --fuzz=0
[   68s] patching file drbd/drbd_receiver.c
[   68s] Hunk #1 succeeded at 6234 (offset -6 lines).
[   68s] + echo 'Patch #2 (reproducible.patch):'
[   68s] Patch #2 (reproducible.patch):
[   68s] + /usr/bin/patch --no-backup-if-mismatch -p1 --fuzz=0
[   68s] patching file drbd/Kbuild
[   68s] Hunk #1 succeeded at 139 (offset 5 lines).
[   68s] + mkdir source
[   68s] + cp -a drbd/. source/.
[   68s] + cp /home/abuild/rpmbuild/SOURCES/drbd_git_revision
source/.drbd_git_revision
[   68s] + exit 0
[   68s] Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.VRk67L
[   68s] + umask 022
[   68s] + cd /home/abuild/rpmbuild/BUILD
[   68s] + /usr/bin/rm -rf
/home/abuild/rpmbuild/BUILDROOT/drbd-9.0.9+git.bffac0d9-74.14.x86_64
[   68s] ++ dirname
/home/abuild/rpmbuild/BUILDROOT/drbd-9.0.9+git.bffac0d9-74.14.x86_64
[   68s] + /usr/bin/mkdir -p /home/abuild/rpmbuild/BUILDROOT
[   68s] + /usr/bin/mkdir
/home/abuild/rpmbuild/BUILDROOT/drbd-9.0.9+git.bffac0d9-74.14.x86_64
[   68s] + cd drbd-9.0.9+git.bffac0d9
[   68s] + rm -rf obj
[   68s] + mkdir obj
[   68s] + ln -s ../scripts obj/
[   68s] + export WANT_DRBD_REPRODUCIBLE_BUILD=1
[   68s] + WANT_DRBD_REPRODUCIBLE_BUILD=1
[   68s] + export CONFIG_BLK_DEV_DRBD=m
[   68s] + CONFIG_BLK_DEV_DRBD=m
[   68s] + export 'EXTRA_CFLAGS=-DVERSION=\"9.0.9+git.bffac0d9\"'
[   68s] + EXTRA_CFLAGS='-DVERSION=\"9.0.9+git.bffac0d9\"'
[   68s] + for flavor in default
[   68s] + rm -rf default
[   68s] + cp -r source default
[   68s] + cp /home/abuild/rpmbuild/SOURCES/Module.supported default
[   68s] + export
DRBDSRC=/home/abuild/rpmbuild/BUILD/drbd-9.0.9+git.bffac0d9/obj/default
[   68s] +
DRBDSRC=/home/abuild/rpmbuild/BUILD/drbd-9.0.9+git.bffac0d9/obj/default
[   68s] + make -C /usr/src/linux-obj/x86_64/default modules
M=/home/abuild/rpmbuild/BUILD/drbd-9.0.9+git.bffac0d9/default
[   68s] make: Entering directory '/usr/src/linux-4.13.12-1-obj/x86_64/default'
[   69s] /usr/src/linux-4.13.12-1/Makefile:942: *** "Cannot generate ORC
metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or
elfutils-libelf-devel".  Stop.
[   69s] make[1]: *** [Makefile:145: sub-make] Error 2
[   69s] make: *** [Makefile:24: __sub-make] Error 2
[   69s] make: Leaving directory '/usr/src/linux-4.13.12-1-obj/x86_64/default'
[   69s] error: Bad exit status from /var/tmp/rpm-tmp.VRk67L (%build)
[   69s] 
[   69s] 
[   69s] RPM build errors:
[   69s]     Bad exit status from /var/tmp/rpm-tmp.VRk67L (%build)
[   69s] 
[   69s] lamb02 failed "build drbd.spec" at Thu Nov 16 16:45:23 UTC 2017.
[   69s] 
[   69s] ### VM INTERACTION START ###
[   72s] [   65.775468] sysrq: SysRq : Power Off
[   72s] [   65.781536] reboot: Power down
[   72s] ### VM INTERACTION END ###
[   72s] 
[   72s] lamb02 failed "build drbd.spec" at Thu Nov 16 16:45:26 UTC 2017.
[   72s] 
============================