About compiling on macOS

[Julian Waters]

Hi,

The errors seem like they can be fixed by dynamically allocating the
arrays rather than trying to use a non constant expression to set the
array size. As the compiler says, variable length arrays are not
allowed in C++. I unfortunately don't have a Mac to test this fix on
however. Perhaps a newer clang version made the variable length array
warning stronger, which causes the compile failure.

best regards,
Julian