To compile type:

make clean
make

Then to install type:

make install

which will install the binaries sha1 and hashcash in /usr/local/bin,
and the man page hashcash.1 in /usr/local/man/man1.

To change the binary installation location change the INSTALL_PATH in
the Makefile.  To change the man page installation location change the
MAN_INSTALL_PATH in the Makefile.

For usage information see the man page.
