I am attempting to build gnu tar master using gcc 8.3.0, and I'm getting the following errors:

  CC       rtapelib.o
In file included from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
                 from /usr/include/netinet/in.h:23,
                 from /usr/include/netdb.h:27,
                 from rtapelib.c:59:
/usr/include/x86_64-linux-gnu/bits/socket.h: In function '__cmsg_nxthdr':
/usr/include/x86_64-linux-gnu/bits/socket.h:315:12: error: cast increases required alignment of target type [-Werror=cast-align]
   __cmsg = (struct cmsghdr ) ((unsigned char ) __cmsg
            ^
rtapelib.c: In function 'rmt_ioctl__':
rtapelib.c:675:18: error: cast increases required alignment of target type [-Werror=cast-align]
  uintmax_t u = (((struct mtop *) argument)->mt_count < 0
                  ^
rtapelib.c:676:27: error: cast increases required alignment of target type [-Werror=cast-align]
          ? - (uintmax_t) ((struct mtop *) argument)->mt_count
                           ^
rtapelib.c:677:25: error: cast increases required alignment of target type [-Werror=cast-align]
          : (uintmax_t) ((struct mtop *) argument)->mt_count);
                         ^
rtapelib.c:684:7: error: cast increases required alignment of target type [-Werror=cast-align]
  if (((struct mtop *) argument)->mt_count < 0)
       ^
rtapelib.c:690:5: error: cast increases required alignment of target type [-Werror=cast-align]
    ((struct mtop *) argument)->mt_op, p);
     ^
rtapelib.c:735:7: error: cast increases required alignment of target type [-Werror=cast-align]
  if (((struct mtget *) argument)->MTIO_CHECK_FIELD < 256)
       ^
cc1: all warnings being treated as errors
make[3]: * [Makefile:1368: rtapelib.o] Error 1
make[3]: Leaving directory '/home/dstromberg/src/gnu-tar/tar/lib'
make[2]: * [Makefile:1305: all] Error 2
make[2]: Leaving directory '/home/dstromberg/src/gnu-tar/tar/lib'
make[1]: * [Makefile:1409: all-recursive] Error 1
make[1]: Leaving directory '/home/dstromberg/src/gnu-tar/tar'
make: * [Makefile:1349: all] Error 2
above cmd output done    2020 Wed Jul 29 04:39:26 PM PDT
dstromberg@zareason-strata7440:~/src/gnu-tar/tar x86_64-pc-linux-gnu 9190

$ gcc -v
below cmd output started 2020 Wed Jul 29 04:39:28 PM PDT
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8.3.0-6' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 8.3.0 (Debian 8.3.0-6)
above cmd output done    2020 Wed Jul 29 04:39:28 PM PDT
dstromberg@zareason-strata7440:~/src/gnu-tar/tar x86_64-pc-linux-gnu 9190

$ cat /etc/debian_version
below cmd output started 2020 Wed Jul 29 04:39:37 PM PDT
10.4

I'm not sure how to proceed.  Any suggestions?

Thanks!