make prepare error

/usr/src/linux # make prepare
  SYSTBL  arch/x86/include/generated/asm/syscalls_32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_32_ia32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_64_x32.h
  SYSTBL  arch/x86/include/generated/asm/syscalls_64.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_32.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_64.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_x32.h
  HOSTCC  arch/x86/tools/relocs_32.o
  HOSTCC  arch/x86/tools/relocs_64.o
  HOSTCC  arch/x86/tools/relocs_common.o
  HOSTLD  arch/x86/tools/relocs
  UPD     include/config/kernel.release
  WRAP    arch/x86/include/generated/uapi/asm/bpf_perf_event.h
  WRAP    arch/x86/include/generated/uapi/asm/poll.h
  WRAP    arch/x86/include/generated/uapi/asm/socket.h
  WRAP    arch/x86/include/generated/asm/dma-contiguous.h
  WRAP    arch/x86/include/generated/asm/early_ioremap.h
  WRAP    arch/x86/include/generated/asm/export.h
  WRAP    arch/x86/include/generated/asm/mcs_spinlock.h
  WRAP    arch/x86/include/generated/asm/mm-arch-hooks.h
  UPD     include/generated/uapi/linux/version.h
  UPD     include/generated/utsrelease.h
  HOSTCC  scripts/selinux/genheaders/genheaders
  HOSTCC  scripts/selinux/mdp/mdp
  HOSTCC  scripts/bin2c
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/pnmtologo
  HOSTCC  scripts/conmakehash
  HOSTCC  scripts/sortextable
  HOSTCC  scripts/asn1_compiler
  HOSTCC  scripts/extract-cert
  CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  CC      scripts/mod/devicetable-offsets.s
  UPD     scripts/mod/devicetable-offsets.h
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  CC      kernel/bounds.s
  UPD     include/generated/bounds.h
  UPD     include/generated/timeconst.h
  CC      arch/x86/kernel/asm-offsets.s
  UPD     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CALL    scripts/atomic/check-atomics.sh
  DESCEND  objtool
  HOSTCC   /usr/src/linux-5.1.0-gentoo/tools/objtool/fixdep.o
  HOSTLD   /usr/src/linux-5.1.0-gentoo/tools/objtool/fixdep-in.o
  LINK     /usr/src/linux-5.1.0-gentoo/tools/objtool/fixdep
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/exec-cmd.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/help.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/pager.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/parse-options.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/run-command.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/sigchain.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/subcmd-config.o
  LD       /usr/src/linux-5.1.0-gentoo/tools/objtool/libsubcmd-in.o
  AR       /usr/src/linux-5.1.0-gentoo/tools/objtool/libsubcmd.a
  GEN      /usr/src/linux-5.1.0-gentoo/tools/objtool/arch/x86/lib/inat-tables.c
awk: arch/x86/tools/gen-insn-attr-x86.awk:260: warning: regexp escape sequence `\:' is not a known regexp operator
awk: arch/x86/tools/gen-insn-attr-x86.awk:350: (FILENAME=arch/x86/lib/x86-opcode-map.txt FNR=41) warning: regexp escape sequence `\&' is not a known regexp operator
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/arch/x86/decode.o
  LD       /usr/src/linux-5.1.0-gentoo/tools/objtool/arch/x86/objtool-in.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/builtin-check.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/builtin-orc.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/check.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/orc_gen.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/orc_dump.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/elf.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/special.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/objtool.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/libstring.o
  CC       /usr/src/linux-5.1.0-gentoo/tools/objtool/str_error_r.o
  LD       /usr/src/linux-5.1.0-gentoo/tools/objtool/objtool-in.o
  LINK     /usr/src/linux-5.1.0-gentoo/tools/objtool/objtool