Haiku build fails under host gcc 7.0.1

[kallisti5]

hrev51023 x86_64 build.

Fedora 26, x86_64

++ /home/kallisti5/Code/haiku/generated.x86_64/objects/linux/x86_64/release/build/libbe/icon/FlatIconImporter.o 
In file included from /home/kallisti5/Code/haiku/src/libs/icon/./IconRenderer.h:18:0,
                 from /home/kallisti5/Code/haiku/src/libs/icon/style/Style.h:18,
                 from /home/kallisti5/Code/haiku/src/libs/icon/flat_icon/FlatIconImporter.cpp:30:
/home/kallisti5/Code/haiku/headers/libs/agg/agg_scanline_u.h: In constructor ‘agg::scanline32_u8_am<AlphaMask>::scanline32_u8_am()’:
/home/kallisti5/Code/haiku/headers/libs/agg/agg_scanline_u.h:469:10: error: invalid use of ‘agg::scanline32_u8_am<AlphaMask>::base_type’
    this->base_type();
          ^~~~~~~~~
/home/kallisti5/Code/haiku/headers/libs/agg/agg_scanline_u.h: In constructor ‘agg::scanline32_u8_am<AlphaMask>::scanline32_u8_am(const AlphaMask&)’:
/home/kallisti5/Code/haiku/headers/libs/agg/agg_scanline_u.h:474:10: error: invalid use of ‘agg::scanline32_u8_am<AlphaMask>::base_type’
    this->base_type();
          ^~~~~~~~~

cc -c "/home/kallisti5/Code/haiku/src/libs/icon/flat_icon/FlatIconImporter.cpp" -O2 -Wall -Wno-trigraphs -Wno-ctor-dtor-privacy -Woverloaded-virtual -Wpointer-arith -Wcast-align -Wsign-compare -Wno-multichar -fPIC -include BeOSBuildCompatibility.h -DARCH_x86_64 -D_NO_INLINE_ASM -D__x86_64__ -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DHAIKU_HOST_PLATFORM_LINUX -DHAIKU_HOST_PLATFORM_64_BIT -DHAIKU_PACKAGING_ARCH=\"x86_64\" -iquote /home/kallisti5/Code/haiku/build/user_config_headers -iquote /home/kallisti5/Code/haiku/build/config_headers -iquote /home/kallisti5/Code/haiku/src/build/libbe/icon -iquote /home/kallisti5/Code/haiku/generated.x86_64/objects/common/build/libbe/icon -iquote /home/kallisti5/Code/haiku/generated.x86_64/objects/linux/x86_64/common/build/libbe/icon -iquote /home/kallisti5/Code/haiku/generated.x86_64/objects/haiku/x86_64/common/build/libbe/icon -iquote /home/kallisti5/Code/haiku/src/libs/icon/. -iquote /home/kallisti5/Code/haiku/src/libs/icon/flat_icon -iquote /home/kallisti5/Code/haiku/src/libs/icon/message -iquote /home/kallisti5/Code/haiku/src/libs/icon/shape -iquote /home/kallisti5/Code/haiku/src/libs/icon/style -iquote /home/kallisti5/Code/haiku/src/libs/icon/transformable -iquote /home/kallisti5/Code/haiku/src/libs/icon/transformer -iquote /home/kallisti5/Code/haiku/src/libs/agg/src -I /home/kallisti5/Code/haiku/headers/libs/agg -I /home/kallisti5/Code/haiku/headers/libs/icon -I /home/kallisti5/Code/haiku/headers/build/private/shared -I /home/kallisti5/Code/haiku/headers/build/host/linux -I /home/kallisti5/Code/haiku/headers/build -I /home/kallisti5/Code/haiku/headers/build/os -I /home/kallisti5/Code/haiku/headers/build/os/add-ons/registrar -I /home/kallisti5/Code/haiku/headers/build/os/app -I /home/kallisti5/Code/haiku/headers/build/os/bluetooth -I /home/kallisti5/Code/haiku/headers/build/os/drivers -I /home/kallisti5/Code/haiku/headers/build/os/kernel -I /home/kallisti5/Code/haiku/headers/build/os/interface -I /home/kallisti5/Code/haiku/headers/build/os/locale -I /home/kallisti5/Code/haiku/headers/build/os/storage -I /home/kallisti5/Code/haiku/headers/build/os/support -I /home/kallisti5/Code/haiku/headers/build/private -o "/home/kallisti5/Code/haiku/generated.x86_64/objects/linux/x86_64/release/build/libbe/icon/FlatIconImporter.o" ;

...failed C++ /home/kallisti5/Code/haiku/generated.x86_64/objects/linux/x86_64/release/build/libbe/icon/FlatIconImporter.o ...

BUILD FAILURE:
...failed updating 1 target(s)...
...skipped 12 target(s)...