Warning: also my noweb-training program.

Extract Makefile and compile with:
 $ notangle -Rmakefile sawsim.nw | sed 's/        /\t/' > Makefile
 $ make
Run the unit tests with
 $ make check

Depends on the GSL (GNU Scientific Library) development package.
 http://www.gnu.org/software/gsl/
This package is libgsl0-dev in Debian-based distributions.