Error:

*** Default configuration is based on 'sandbox_defconfig'
make[5]: Leaving directory '/home/osboxes/lime-build/build/src/build_dir/host/u-boot-2014.10'
make -C /home/osboxes/lime-build/build/src/build_dir/host/u-boot-2014.10 tools-only  HOSTCFLAGS="-I/home/osboxes/lime-build/build/src/staging_dir/host/include -I/home/osboxes/lime-build/build/src/staging_dir/host/usr/include -O2 -I/home/osboxes/lime-build/build/src/staging_dir/host/include -I/home/osboxes/lime-build/build/src/staging_dir/host/usr/include" HOSTLDFLAGS="-L/home/osboxes/lime-build/build/src/staging_dir/host/lib -L/home/osboxes/lime-build/build/src/staging_dir/host/usr/lib"
make[5]: Entering directory '/home/osboxes/lime-build/build/src/build_dir/host/u-boot-2014.10'
scripts/kconfig/conf --silentoldconfig Kconfig
  CHK     include/config.h
  UPD     include/config.h
  GEN     include/autoconf.mk
In file included from include/linux/compiler.h:54:0,
                 from /home/osboxes/lime-build/build/src/build_dir/host/u-boot-2014.10/arch/sandbox/include/asm/bitops.h:20,
                 from include/linux/bitops.h:110,
                 from /home/osboxes/lime-build/build/src/build_dir/host/u-boot-2014.10/include/common.h:20:
include/linux/compiler-gcc.h:114:30: fatal error: linux/compiler-gcc6.h: No such file or directory
 #include gcc_header(__GNUC__)
                              ^