>>> Unpacking source...
>>> Unpacking dhcpv6-1.0.22.tar.gz to /var/tmp/portage/net-misc/dhcpv6-1.0.22-r1/work
>>> Source unpacked in /var/tmp/portage/net-misc/dhcpv6-1.0.22-r1/work
>>> Compiling source in /var/tmp/portage/net-misc/dhcpv6-1.0.22-r1/work/dhcpv6-1.0.22 ...
 * econf: updating dhcpv6-1.0.22/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating dhcpv6-1.0.22/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for style of include used by make... GNU
checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
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checking whether we are using the GNU C compiler... yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... yes
checking for x86_64-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking dependency style of x86_64-pc-linux-gnu-gcc... gcc3
checking how to run the C preprocessor... x86_64-pc-linux-gnu-gcc -E
checking for x86_64-pc-linux-gnu-gcc... (cached) x86_64-pc-linux-gnu-gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... (cached) yes
checking for x86_64-pc-linux-gnu-gcc option to accept ISO C89... (cached) none needed
checking dependency style of x86_64-pc-linux-gnu-gcc... (cached) gcc3
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checking host system type... x86_64-pc-linux-gnu
checking for a sed that does not truncate output... /bin/sed
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checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for /usr/x86_64-pc-linux-gnu/bin/ld option to reload object files... -r
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checking whether x86_64-pc-linux-gnu-g++ accepts -g... yes
checking dependency style of x86_64-pc-linux-gnu-g++... gcc3
checking how to run the C++ preprocessor... x86_64-pc-linux-gnu-g++ -E
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checking whether we are using the GNU Fortran 77 compiler... yes
checking whether x86_64-pc-linux-gnu-gfortran accepts -g... yes
checking the maximum length of command line arguments... 1572864
checking command to parse /usr/bin/nm -B output from x86_64-pc-linux-gnu-gcc object... ok
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checking whether the x86_64-pc-linux-gnu-gcc linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
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checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
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configure: creating libtool
appending configuration tag "CXX" to libtool
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checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) is GNU ld... yes
checking whether the x86_64-pc-linux-gnu-g++ linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking for x86_64-pc-linux-gnu-g++ option to produce PIC... -fPIC
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checking dynamic linker characteristics... GNU/Linux ld.so
(cached) (cached) checking how to hardcode library paths into programs... immediate
appending configuration tag "F77" to libtool
checking if libtool supports shared libraries... yes
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checking for x86_64-pc-linux-gnu-gfortran option to produce PIC... -fPIC
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checking whether the x86_64-pc-linux-gnu-gfortran linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking dynamic linker characteristics... GNU/Linux ld.so
(cached) (cached) checking how to hardcode library paths into programs... immediate
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checking for isc-dhcp/libdhcp_control.h... no
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checking for uint16_t... yes
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checking for struct in6_ifreq.ifr6_addr... no
checking vfork.h usability... no
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checking for working vfork... (cached) yes
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checking types of arguments for select... int,fd_set *,struct timeval *
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checking pkg-config is at least version 0.9.0... yes
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checking whether x86_64-pc-linux-gnu-gcc and cc understand -c and -o together... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating include/Makefile
config.status: creating src/Makefile
config.status: creating man/Makefile
config.status: creating etc/Makefile
config.status: creating etc/sysconfig/Makefile
config.status: creating etc/init.d/Makefile
config.status: creating config.h
config.status: executing depfiles commands
 * Applying fix-gnusource-collisions.patch ...
  [ ok ]
make -s -j3 
Making all in include
Making all in src
mkdir .libs
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../include -DLIBDHCP -D_GNU_SOURCE -fPIC -O2 -march=x86-64 -pipe -MT libdhcp6client_la-client6_addr.lo -MD -MP -MF .deps/libdhcp6client_la-client6_addr.Tpo -c client6_addr.c  -fPIC -DPIC -o .libs/libdhcp6client_la-client6_addr.o
In file included from client6_addr.c:59:
/usr/include/linux/ipv6.h:19: error: redefinition of 'struct in6_pktinfo'
make[3]: *** [libdhcp6client_la-client6_addr.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../include -DLIBDHCP -D_GNU_SOURCE -fPIC -O2 -march=x86-64 -pipe -MT libdhcp6client_la-cfg.lo -MD -MP -MF .deps/libdhcp6client_la-cfg.Tpo -c cfg.c  -fPIC -DPIC -o .libs/libdhcp6client_la-cfg.o
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../include -DLIBDHCP -D_GNU_SOURCE -fPIC -O2 -march=x86-64 -pipe -MT libdhcp6client_la-dhcp6c.lo -MD -MP -MF .deps/libdhcp6client_la-dhcp6c.Tpo -c dhcp6c.c  -fPIC -DPIC -o .libs/libdhcp6client_la-dhcp6c.o
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../include -DLIBDHCP -D_GNU_SOURCE -fPIC -O2 -march=x86-64 -pipe -MT libdhcp6client_la-cfg.lo -MD -MP -MF .deps/libdhcp6client_la-cfg.Tpo -c cfg.c -o libdhcp6client_la-cfg.o >/dev/null 2>&1
In file included from dhcp6c.c:78:
/usr/include/linux/ipv6.h:19: error: redefinition of 'struct in6_pktinfo'
make[3]: *** [libdhcp6client_la-dhcp6c.lo] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2