Various include files.

vplot.h here should be linked to /usr/include/vplot.h.

All site-dependent parameters are kept in params.h and vplot.h.

If you can't get the Hershey fonts and have to limp along with only
the "pen" font which comes with this distribution, you will have to
edit the file font_definitions.h so that gentext.c doesn't try to
include the roman simplex and roman complex Hershey fonts.
Read the README file in the ./vplotfonts directory.

	- Joe Dellinger
