mjhjmtu

I am new in gentoo. I am trying to install gentoo (genkernel) and I have boost as dependency. I got this error in log file:
What is the problem and what I need to correct?

 b2
 --user-config=/var/tmp/portage/dev-libs/boost-1.63.0/work/boost_1_63_0-abi_x86_64.amd64/user-config.jam
 gentoodebug -j2 -q -d+2 -sICU_PATH=/usr pch=off
 --boost-build=/usr/share/boost-build --prefix=/var/tmp/portage/dev-libs/boost-1.63.0/image/usr --layout=system threading=multi link=shared,static Performing configuration checks

- 32-bit : no (cached)
- 64-bit : yes (cached)
- arm : no (cached)
- mips1 : no (cached)
- power : no (cached)
- sparc : no (cached)
- x86 : yes (cached)
- symlinks supported : yes
- has_icu builds : yes (cached)
- lockfree boost::atomic_flag : yes (cached)
error: Name clash for '<p../dist/bin>auto_index'
error: 
error: Tried to build the target twice, with property sets having
error: these incompatible properties:
error:
error: - none
error: - <format>html
error:
error: Please make sure to have consistent requirements for
these error: properties everywhere in your project, especially for
install error: targets.

ERROR: dev-libs/boost-1.63.0::gentoo failed (compile phase): 
Building of Boost tools failed
Call stack: 
 ebuild.sh, line 124: Called src_compile
environment, line 4352: Called multilib-minimal_src_compile 
environment, line 2469: Called multilib_foreach_abi 'multilib-minimal_abi_src_compile' 
environment, line 2700: Called multibuild_foreach_variant '_multilib_multibuild_wrapper' 'multilib-minimal_abi_src_compile'
environment, line 2347: Called _multibuild_run _multilib_multibuild_wrapper' 'multilib-minimal_abi_src_compile'
environment, line 2345: Called _multilib_multibuild_wrapper 'multilib-minimal_abi_src_compile'
environment, line 413: Called multilib-minimal_abi_src_compile
environment, line 2463: Called multilib_src_compile 
environment, line 2960: Called die
The specific snippet of code:
ejam "$OPTIONS[@]" $PYTHON_OPTIONS || die "Building of Boost tools failed"; 
If you need support, post the output of `emerge --info '=dev-libs/boost-1.63.0::gentoo'`,
the complete build log and the output of `emerge -pqv '=dev-libs/boost-1.63.0::gentoo'`.
The complete build log is located at '/var/tmp/portage/dev-libs/boost-1.63.0/temp/build.log'. 
The ebuild environment file is located at '/var/tmp/portage/dev-libs/boost-1.63.0/temp/environment'. 
Working directory: '/var/tmp/portage/dev-libs/boost-1.63.0/work/boost_1_63_0-abi_x86_64.amd64/tools'
S: '/var/tmp/portage/dev-libs/boost-1.63.0/work/boost_1_63_0'