bitcoin: guix: building for `aarch64-linux-gnu` on aarch64 fails

Running a Guix build of master (f002f8a0e76bd5abd60ef6809b1ff2b4c2d56071) using:

HOSTS="aarch64-linux-gnu" ./contrib/guix/guix-build

on aarch64 hardware (Alpine Docker container, running on Apple M1) currently fails with the following:

cc1: error: no include path in which to search for stdc-predef.h
/gnu/store/lzf5zg0diw2bhh2qji4bl2v46wd8pylc-bash-minimal-5.1.8/bin/bash ../../gcc-10.3.0/gcc/../move-if-change tmp-macro_list macro_list
echo timestamp > s-macro_list
rm -rf include-fixed; mkdir include-fixed
chmod a+rx include-fixed
if [ -d ../prev-gcc ]; then \
  cd ../prev-gcc && \
  make real-install-headers-tar DESTDIR=`pwd`/../gcc/ \
    libsubdir=. ; \
else \
  set -e; for ml in `cat fixinc_list`; do \
    sysroot_headers_suffix=`echo ${ml} | sed -e 's/;.*$//'`; \
    multi_dir=`echo ${ml} | sed -e 's/^[^;]*;//'`; \
    fix_dir=include-fixed${multi_dir}; \
    if ! false && test ! -d `echo /usr/include | sed -e :a -e 's,[^/]*/\.\.\/,,' -e ta`; then \
      echo The directory that should contain system headers does not exist: >&2 ; \
      echo "  `echo /usr/include | sed -e :a -e 's,[^/]*/\.\.\/,,' -e ta`" >&2 ; \
      tooldir_sysinc=`echo "/gnu/store/bp869rrz2z24yvjyma9kkj0alzxvqkc2-gcc-cross-sans-libc-aarch64-linux-gnu-10.3.0-lib/lib/gcc/aarch64-linux-gnu/10.3.0/../../../../../../../aarch64-linux-gnu/sys-include" | sed -e :a -e "s,[^/]*/\.\.\/,," -e ta`; \
      if test "x`echo /usr/include | sed -e :a -e 's,[^/]*/\.\.\/,,' -e ta`" = "x${tooldir_sysinc}"; \
      then sleep 1; else exit 1; fi; \
    fi; \
    /gnu/store/lzf5zg0diw2bhh2qji4bl2v46wd8pylc-bash-minimal-5.1.8/bin/bash ../../gcc-10.3.0/gcc/../mkinstalldirs ${fix_dir}; \
    chmod a+rx ${fix_dir} || true; \
    (TARGET_MACHINE='aarch64-unknown-linux-gnu'; srcdir=`cd ../../gcc-10.3.0/gcc; ${PWDCMD-pwd}`; \
      SHELL='/gnu/store/lzf5zg0diw2bhh2qji4bl2v46wd8pylc-bash-minimal-5.1.8/bin/bash'; MACRO_LIST=`${PWDCMD-pwd}`/macro_list ; \
      gcc_dir=`${PWDCMD-pwd}` ; \
      export TARGET_MACHINE srcdir SHELL MACRO_LIST && \
      cd ../build-aarch64-unknown-linux-gnu/fixincludes && \
      /gnu/store/lzf5zg0diw2bhh2qji4bl2v46wd8pylc-bash-minimal-5.1.8/bin/bash ./fixinc.sh "${gcc_dir}/${fix_dir}" \
        `echo /usr/include | sed -e :a -e 's,[^/]*/\.\.\/,,' -e ta`  ); \
    rm -f ${fix_dir}/syslimits.h; \
    if [ -f ${fix_dir}/limits.h ]; then \
      mv ${fix_dir}/limits.h ${fix_dir}/syslimits.h; \
    else \
      cp ../../gcc-10.3.0/gcc/gsyslimits.h ${fix_dir}/syslimits.h; \
    fi; \
    chmod a+r ${fix_dir}/syslimits.h; \
  done; \
fi
The directory that should contain system headers does not exist:
  /usr/include
make[3]: *** [Makefile:3172: stmp-fixinc] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/tmp/guix-build-gcc-cross-sans-libc-aarch64-linux-gnu-10.3.0.drv-0/build/gcc'
make[2]: *** [Makefile:4688: all-stage1-gcc] Error 2
make[2]: Leaving directory '/tmp/guix-build-gcc-cross-sans-libc-aarch64-linux-gnu-10.3.0.drv-0/build'
make[1]: *** [Makefile:18381: stage1-bubble] Error 2
make[1]: Leaving directory '/tmp/guix-build-gcc-cross-sans-libc-aarch64-linux-gnu-10.3.0.drv-0/build'
make: *** [Makefile:946: all] Error 2

Full build log.