This is a wrapper around the fxlibc project which is the standard system C library implementation for all Casio fx calculators.
You can use the scripts/install.sh --help to see manual installation of the
project. But, since the compiler needed to build the vxOpenLibm is
sh-elf-vhex which automatically installs this project, you theoretically do
not need to do so.
See the original
REAME file
of the fxlibc project for further information.
Note that fxlibc uses the CC0 1.0 Universal License, see
LICENSE
A big thanks to Lephenixnoir who ported most of the standard!