In this distribution:

README      This file
matfun.glb  The compiled library for the G(X)
matfun.slb  The compiled library for the S(X)
matfun.src  The source code suitable for compilation with Jazz.
matfun.h    The main header file.
matfun.hg   G(X) specific header file
matfun.hs   S(X) specific header file
matfun.txt  Inadequate documentation

To install:
Download either matfun.glb or matfun.slb (depending upon what type
of calculator you have). RCL the library to the stack and purge the
variable it was in. Execute 0 STO and then warm start your calculator
(press ON+C). If all is OK, it should be available in the library
menu.