CORECLR ERROR

I think the problem may be here:
Not searching for unused variables given on the command line.
  -- The C compiler identification is Clang 6.0.1
  -- The CXX compiler identification is Clang 6.0.1
  -- Check for working C compiler: /usr/bin/clang-6.0
  -- Check for working C compiler: /usr/bin/clang-6.0 -- works
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Check for working CXX compiler: /usr/bin/clang++-6.0
  -- Check for working CXX compiler: /usr/bin/clang++-6.0 -- works
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  Detected Linux x86_64
  -- Performing Test COMPILER_SUPPORTS_F_STACK_PROTECTOR_STRONG
  -- Performing Test COMPILER_SUPPORTS_F_STACK_PROTECTOR_STRONG - Success
  -- Performing Test COMPILER_SUPPORTS_W_IMPLICIT_FALLTHROUGH
  -- Performing Test COMPILER_SUPPORTS_W_IMPLICIT_FALLTHROUGH - Success
  -- The ASM compiler identification is Clang
  -- Found assembler: /usr/bin/clang-6.0
  -- Performing Test HAVE_LTO
  -- Performing Test HAVE_LTO - Success
  -- Performing Test COMPILER_SUPPORTS_F_ALIGNED_NEW
  -- Performing Test COMPILER_SUPPORTS_F_ALIGNED_NEW - Success
  -- Performing Test C_SUPPORTS_WUNGUARDED_AVAILABILITY
  -- Performing Test C_SUPPORTS_WUNGUARDED_AVAILABILITY - Success
  -- Looking for include files sys/socket.h, linux/in.h
  -- Looking for include files sys/socket.h, linux/in.h - found
  -- Performing Test HAVE_IN_PKTINFO
  -- Performing Test HAVE_IN_PKTINFO - Success
  -- Performing Test HAVE_IP_MREQN
  -- Performing Test HAVE_IP_MREQN - Success
  -- Performing Test HAVE_FLOCK64
  -- Performing Test HAVE_FLOCK64 - Success
  -- Looking for O_CLOEXEC
  -- Looking for O_CLOEXEC - found
  -- Looking for F_DUPFD_CLOEXEC
  -- Looking for F_DUPFD_CLOEXEC - found
  -- Looking for F_FULLFSYNC
  -- Looking for F_FULLFSYNC - not found
  -- Looking for getifaddrs
  -- Looking for getifaddrs - found
  -- Looking for fork
  -- Looking for fork - found
  -- Looking for lseek64
  -- Looking for lseek64 - found
  -- Looking for mmap64
  -- Looking for mmap64 - found
  -- Looking for ftruncate64
  -- Looking for ftruncate64 - found
  -- Looking for posix_fadvise64
  -- Looking for posix_fadvise64 - found
  -- Looking for stat64
  -- Looking for stat64 - found
  -- Looking for vfork
  -- Looking for vfork - found
  -- Looking for pipe2
  -- Looking for pipe2 - found
  -- Looking for getmntinfo
  -- Looking for getmntinfo - not found
  -- Looking for strcpy_s
  -- Looking for strcpy_s - not found
  -- Looking for strlcpy
  -- Looking for strlcpy - not found
  -- Looking for posix_fadvise
  -- Looking for posix_fadvise - found
  -- Looking for ioctl
  -- Looking for ioctl - found
  -- Looking for sched_getaffinity
  -- Looking for sched_getaffinity - found
  -- Looking for sched_setaffinity
  -- Looking for sched_setaffinity - found
  -- Looking for pthread_setcancelstate
  -- Looking for pthread_setcancelstate - found
  -- Looking for arc4random_buf
  -- Looking for arc4random_buf - not found
  -- Looking for TIOCGWINSZ
  -- Looking for TIOCGWINSZ - found
  -- Looking for tcgetattr
  -- Looking for tcgetattr - found
  -- Looking for tcsetattr
  -- Looking for tcsetattr - found
  -- Looking for ECHO
  -- Looking for ECHO - found
  -- Looking for ICANON
  -- Looking for ICANON - found
  -- Looking for TCSANOW
  -- Looking for TCSANOW - found
  -- Looking for cfsetspeed
  -- Looking for cfsetspeed - found
  -- Looking for cfmakeraw
  -- Looking for cfmakeraw - found
  -- Performing Test HAVE_UTSNAME_DOMAINNAME
  -- Performing Test HAVE_UTSNAME_DOMAINNAME - Success
  -- Performing Test HAVE_STAT_BIRTHTIME
  -- Performing Test HAVE_STAT_BIRTHTIME - Failed
  -- Performing Test HAVE_STAT_FLAGS
  -- Performing Test HAVE_STAT_FLAGS - Failed
  -- Looking for lchflags
  -- Looking for lchflags - not found
  -- Performing Test HAVE_STAT_TIMESPEC
  -- Performing Test HAVE_STAT_TIMESPEC - Failed
  -- Performing Test HAVE_STAT_TIM
  -- Performing Test HAVE_STAT_TIM - Success
  -- Performing Test HAVE_STAT_NSEC
  -- Performing Test HAVE_STAT_NSEC - Failed
  -- Performing Test HAVE_DIRENT_NAME_LEN
  -- Performing Test HAVE_DIRENT_NAME_LEN - Failed
  -- Performing Test HAVE_STATFS_FSTYPENAME
  -- Performing Test HAVE_STATFS_FSTYPENAME - Failed
  -- Performing Test HAVE_STATVFS_FSTYPENAME
  -- Performing Test HAVE_STATVFS_FSTYPENAME - Failed
  -- Looking for statfs
  -- Looking for statfs - found
  -- Check size of struct statfs
  -- Check size of struct statfs - done
  -- Performing Test HAVE_GNU_STRERROR_R
  -- Performing Test HAVE_GNU_STRERROR_R - Success
  -- Performing Test HAVE_READDIR_R
  -- Performing Test HAVE_READDIR_R - Failed
  -- Performing Test KEVENT_HAS_VOID_UDATA
  -- Performing Test KEVENT_HAS_VOID_UDATA - Failed
  -- Performing Test HAVE_FDS_BITS
  -- Performing Test HAVE_FDS_BITS - Failed
  -- Performing Test HAVE_PRIVATE_FDS_BITS
  -- Performing Test HAVE_PRIVATE_FDS_BITS - Failed
  -- Performing Test HAVE_SENDFILE_4
  -- Performing Test HAVE_SENDFILE_4 - Success
  -- Performing Test HAVE_SENDFILE_6
  -- Performing Test HAVE_SENDFILE_6 - Failed
  -- Performing Test HAVE_SENDFILE_7
  -- Performing Test HAVE_SENDFILE_7 - Failed
  -- Looking for fcopyfile
  -- Looking for fcopyfile - not found
  -- Looking for include file sys/sockio.h
  -- Looking for include file sys/sockio.h - not found
  -- Looking for include file linux/ethtool.h
  -- Looking for include file linux/ethtool.h - found
  -- Looking for include file sys/poll.h
  -- Looking for include file sys/poll.h - found
  -- Looking for include file sys/proc_info.h
  -- Looking for include file sys/proc_info.h - not found
  -- Looking for epoll_create1
  -- Looking for epoll_create1 - found
  -- Looking for accept4
  -- Looking for accept4 - found
  -- Looking for kqueue
  -- Looking for kqueue - not found
  -- Looking for disconnectx
  -- Looking for disconnectx - not found
  -- Performing Test HAVE_GETNAMEINFO_SIGNED_FLAGS
  -- Performing Test HAVE_GETNAMEINFO_SIGNED_FLAGS - Success
  -- Performing Test HAVE_SHM_OPEN_THAT_WORKS_WELL_ENOUGH_WITH_MMAP
  -- Performing Test HAVE_SHM_OPEN_THAT_WORKS_WELL_ENOUGH_WITH_MMAP - Success
  -- Performing Test HAVE_CLOCK_MONOTONIC
  -- Performing Test HAVE_CLOCK_MONOTONIC - Success
  -- Performing Test HAVE_CLOCK_REALTIME
  -- Performing Test HAVE_CLOCK_REALTIME - Success
  -- Looking for clock_gettime_nsec_np
  -- Looking for clock_gettime_nsec_np - not found
  -- Looking for futimes
  -- Looking for futimes - found
  -- Looking for futimens
  -- Looking for futimens - found
  -- Looking for utimensat
  -- Looking for utimensat - found
  -- Performing Test BIND_ADDRLEN_UNSIGNED
  -- Performing Test BIND_ADDRLEN_UNSIGNED - Success
  -- Performing Test IPV6MR_INTERFACE_UNSIGNED
  -- Performing Test IPV6MR_INTERFACE_UNSIGNED - Success
  -- Looking for include file sys/inotify.h
  -- Looking for include file sys/inotify.h - found
  -- Performing Test INOTIFY_RM_WATCH_WD_UNSIGNED
  -- Performing Test INOTIFY_RM_WATCH_WD_UNSIGNED - Failed
  -- Checking prototype getpriority for PRIORITY_REQUIRES_INT_WHO - False
  -- Checking prototype kevent for KEVENT_REQUIRES_INT_PARAMS - False
  -- Checking prototype statfs for HAVE_NON_LEGACY_STATFS - True
  -- Performing Test HAVE_MKSTEMPS
  -- Performing Test HAVE_MKSTEMPS - Success
  -- Performing Test HAVE_MKSTEMP
  -- Performing Test HAVE_MKSTEMP - Success
  -- Performing Test HAVE_NETINET_TCP_VAR_H
  -- Performing Test HAVE_NETINET_TCP_VAR_H - Failed
  -- Performing Test HAVE_NETINET_UDP_VAR_H
  -- Performing Test HAVE_NETINET_UDP_VAR_H - Failed
  -- Performing Test HAVE_NETINET_IP_VAR_H
  -- Performing Test HAVE_NETINET_IP_VAR_H - Failed
  -- Performing Test HAVE_NETINET_ICMP_VAR_H
  -- Performing Test HAVE_NETINET_ICMP_VAR_H - Failed
  -- Looking for include file sys/cdefs.h
  -- Looking for include file sys/cdefs.h - found
  -- Performing Test HAVE_TCP_H_TCPSTATE_ENUM
  -- Performing Test HAVE_TCP_H_TCPSTATE_ENUM - Success
  -- Looking for TCPS_ESTABLISHED
  -- Looking for TCPS_ESTABLISHED - not found
  -- Looking for getgrouplist
  -- Looking for getgrouplist - found
  -- Check size of struct rt_msghdr
  -- Check size of struct rt_msghdr - failed
  -- Check size of struct rt_msghdr2
  -- Check size of struct rt_msghdr2 - failed
  -- Check size of struct if_msghdr2
  -- Check size of struct if_msghdr2 - failed
  -- Looking for include files sys/types.h, sys/sysctl.h
  -- Looking for include files sys/types.h, sys/sysctl.h - not found
  -- Looking for include file sys/ioctl.h
  -- Looking for include file sys/ioctl.h - found
  -- Looking for include file sys/filio.h
  -- Looking for include file sys/filio.h - not found
  -- Looking for include files sys/types.h, netpacket/packet.h
  -- Looking for include files sys/types.h, netpacket/packet.h - found
  -- Looking for include file net/if_arp.h
  -- Looking for include file net/if_arp.h - found
  -- Looking for include file sys/mntent.h
  -- Looking for include file sys/mntent.h - not found
  -- Looking for include files stdint.h, net/if_media.h
  -- Looking for include files stdint.h, net/if_media.h - not found
  -- Looking for include file linux/rtnetlink.h
  -- Looking for include file linux/rtnetlink.h - found
  -- Looking for include file linux/can.h
  -- Looking for include file linux/can.h - found
  -- Looking for include file IOKit/serial/ioss.h
  -- Looking for include file IOKit/serial/ioss.h - not found
  -- Looking for getpeereid
  -- Looking for getpeereid - not found
  -- Looking for getdomainname
  -- Looking for getdomainname - found
  -- Looking for uname
  -- Looking for uname - found
  -- Performing Test HAVE_GETDOMAINNAME_SIZET
  -- Performing Test HAVE_GETDOMAINNAME_SIZET - Success
  -- Looking for inotify_init
  -- Looking for inotify_init - found
  -- Looking for inotify_add_watch
  -- Looking for inotify_add_watch - found
  -- Looking for inotify_rm_watch
  -- Looking for inotify_rm_watch - found
  -- Looking for include file GSS/GSS.h
  -- Looking for include file GSS/GSS.h - not found
  -- Looking for GSS_SPNEGO_MECHANISM
  -- Looking for GSS_SPNEGO_MECHANISM - not found
  -- Looking for GSS_KRB5_CRED_NO_CI_FLAGS_X
  -- Looking for GSS_KRB5_CRED_NO_CI_FLAGS_X - not found
  -- Looking for getauxval
  -- Looking for getauxval - found
  -- Looking for include file crt_externs.h
  -- Looking for include file crt_externs.h - not found
  -- Performing Test HAVE_IN_EXCL_UNLINK
  -- Performing Test HAVE_IN_EXCL_UNLINK - Success
  -- Performing Test HAVE_TCP_H_TCP_KEEPALIVE
  -- Performing Test HAVE_TCP_H_TCP_KEEPALIVE - Failed
  -- Performing Test HAVE_BUILTIN_MUL_OVERFLOW
  -- Performing Test HAVE_BUILTIN_MUL_OVERFLOW - Failed
  -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")
  -- Performing Test HAVE_UDAT_STANDALONE_SHORTER_WEEKDAYS
  -- Performing Test HAVE_UDAT_STANDALONE_SHORTER_WEEKDAYS - Success
  -- Looking for ucol_setMaxVariable
  -- Looking for ucol_setMaxVariable - found