To build, gmake is required, as is a compiler that supports C99, or at least the
subset of C99 that these tools make use of.  Most modern compilers should work.

A POSIX environment is also required.  These should port rather easily to other
environments.  The most onerous requirement is probably that seeking beyond the
end of a file is expected to work and create a hole that will be interpreted as
zeroes.  Patches to support non-POSIX environments are welcome.

Chris Spiegel
cspiegel@gmail.com