It was very easy to "build" this package on arm64. All I did was:
* Modify each konfigure.perl to set $BITS = 64 instead of die "unrecognized Architecture '$ARCH'". * Provide ngs-sdk/ngs/unix/aarch64/atomic32.h containing stubs. Now, if you wanted the package to actually work, you would presumably provide proper implementations in atomic32.h. They could use inline assembler, like in x86_64/atomic32.h, but perhaps it would be better to use GCC built-ins.