/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/ is in libgcc-8-dev-powerpc-cross 8-20180414-1ubuntu2cross1.
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/usr/lib/gcc-cross/powerpc-linux-gnu/8/include-fixed/README
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include-fixed/limits.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include-fixed/syslimits.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/altivec.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/amo.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/backtrace-supported.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/backtrace.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/bmi2intrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/bmiintrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/emmintrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/float.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/gcov.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/htmintrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/htmxlintrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/iso646.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/mm_malloc.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/mmintrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/omp.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/openacc.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/paired.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/ppc-asm.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/ppu_intrinsics.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/sanitizer/
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/sanitizer/asan_interface.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/sanitizer/common_interface_defs.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/sanitizer/lsan_interface.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/sanitizer/tsan_interface.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/si2vmx.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/spu2vmx.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdalign.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdarg.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdatomic.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdbool.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stddef.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdfix.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdint-gcc.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdint.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/stdnoreturn.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/unwind.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/varargs.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/vec_types.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/x86intrin.h
/usr/lib/gcc-cross/powerpc-linux-gnu/8/include/xmmintrin.h