| To make troff (actually a.out): | 
 |  | 
 | 	make | 
 |  | 
 | You will also need to write a driver for your favorite output device. | 
 | d202.c provides a model, although it is specialized to a machine no | 
 | one has.  There are also a variety of postscript drivers that are the | 
 | best thing to use if you have a postscript device. | 
 |  | 
 | You will also have to make a DESC file for your typesetter and some | 
 | font description files; see dev202 for examples.  These describe the | 
 | named characters, widths, kerning information, and output codes. | 
 |  | 
 | Nroff is the same program as troff, so you should | 
 |  | 
 | 	cp a.out /usr/bin/troff | 
 | 	ln /usr/bin/troff /usr/bin/nroff | 
 |  | 
 | or the equivalent. | 
 |  | 
 | You will also need terminal description files for your terminals; see | 
 | tab.37, tab.450 and tab.lp for examples. | 
 |  | 
 | Troff uses files that are normally stored in /usr/lib/font; | 
 | macro packages are in /usr/lib/tmac; and nroff tables are in | 
 | /usr/lib/term.  You can edit tdef.h to change these assumptions. | 
 |  | 
 | There have been a few features since the last version, and a number of | 
 | significant internal changes.  Not all are improvements, of course. | 
 | Most of the more recent changes, including bug fixes, are in FIXES, | 
 | which you should read also. |