>>> host-uboot-tools 2021.04 Extracting
bzcat /home/buildroot/autobuild/run/instance-0/dl/uboot-tools/u-boot-2021.04.tar.bz2 | tar --strip-components=1 -C /home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04   -xf -
>>> host-uboot-tools 2021.04 Patching

Applying 0001-drop-configh-from-tools.patch using patch: 
patching file tools/env/fw_env_private.h

Applying 0002-tools-only-in-no-dot-config-targets.patch using patch: 
patching file Makefile
Hunk #1 succeeded at 507 (offset 21 lines).

Applying 0003-drop-autoconf.h-from-tools.patch using patch: 
patching file tools/imximage.c
>>> host-uboot-tools 2021.04 Configuring
mkdir -p /home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04/include/config
touch /home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04/include/config/auto.conf
>>> host-uboot-tools 2021.04 Building
/home/buildroot/autobuild/run/instance-0/output-1/host/bin/host-make -j1 -C /home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04 HOSTCC="/usr/bin/gcc" HOSTCFLAGS="-O2 -I/home/buildroot/autobuild/run/instance-0/output-1/host/include" HOSTLDFLAGS="-L/home/buildroot/autobuild/run/instance-0/output-1/host/lib -Wl,-rpath,/home/buildroot/autobuild/run/instance-0/output-1/host/lib" CONFIG_FIT=y CONFIG_MKIMAGE_DTC_PATH=dtc tools-only
host-make[1]: Entering directory '/home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04'
  HOSTCC  scripts/basic/fixdep
  UPD     include/config/uboot.release
  UPD     include/generated/version_autogenerated.h
  UPD     include/generated/timestamp_autogenerated.h
  COPY    tools/version.h
  HOSTCC  tools/mkenvimage.o
  HOSTCC  tools/os_support.o
  WRAP    tools/lib/crc32.c
  HOSTCC  tools/lib/crc32.o
  HOSTLD  tools/mkenvimage
  HOSTCC  tools/aisimage.o
  HOSTCC  tools/atmelimage.o
  HOSTCC  tools/fit_common.o
  HOSTCC  tools/fit_image.o
  HOSTCC  tools/image-host.o
  WRAP    tools/common/image-fit.c
  HOSTCC  tools/common/image-fit.o
In file included from ./tools/../common/image-fit.c:33:0,
                 from tools/common/image-fit.c:1:
include/linux/kconfig.h:4:32: fatal error: generated/autoconf.h: No such file or directory
 #include <generated/autoconf.h>
                                ^
compilation terminated.
host-make[2]: *** [scripts/Makefile.host:112: tools/common/image-fit.o] Error 1
host-make[1]: *** [Makefile:1955: tools-only] Error 2
host-make[1]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04'
make: *** [/home/buildroot/autobuild/run/instance-0/output-1/build/host-uboot-tools-2021.04/.stamp_built] Error 2
make: Leaving directory `/home/buildroot/autobuild/run/instance-0/buildroot'