AARCH64 build method
$ export ac_cv_func_malloc_0_nonnull=yes # for undefined reference to `rpl_malloc'
$ export ac_cv_func_realloc_0_nonnull=yes # for undefined reference to `rpl_realloc'
$ export PATH=$PATH:/home/kyuwoncho18/sslab/pacability/dev/gcc-arm-10.2-2020.11-x86_64-aarch64-none-linux-gnu/bin
$ ./autogen.sh --host=arm-gnuabi-linux CC=aarch64-none-linux-gnu-gcc
$ make