The c code requires the meschach library for the matrix handling,
solving, etc.  The source code for the library is in ./meschach.  
Or, change the appropriate parts of the C code to use, e.g. LAPACK++.
	The Makefile's first two lines will need some modifications for
your system. 

To run:
	1. Define all relevant functions in s3mi.map, and run it (in maple)
	2. Do a   "make sinc3n3"
	3. run  sinc3n3
	4. The computed answer is put into tmp.u, the derivative in tmp.up

The file s3comp.map reads the calculated answers in Maple.  They can be
plotted,e.g. with 
	plot(ucalc);
By defining the exact answer in s3comp.map, and doing
	read `s3comp.map`;
	edp := pld(ucalc, exa);
	plot({ucalc, edp});
one gets a plot showing the exact answer against the computed one, at
the computed answer's grid points.