I ran accross this bug in diff when giving the wrong option by mistake.
I was diffing two /etc dirs and did a "diff -l" to get a report of files
only (thinking like "egrep -l", oh well...).  Anyways, I got the following
error message:

	nirvana::root-3# diff -l etc /etc
	diff: /bin/pr: No such file or directory
	Broken pipe
	nirvana::root-4# exit
	exit

Well, I thought I'd be smart and just link it, but this got me:

	nirvana::root-1# diff -l etc /etc
	pr: illegal option -- f
	usage: pr [+page] [-col] [-adFmrt] [-e[ch][gap]] [-h header]
	          [-i[ch][gap]] [-l line] [-n[ch][width]] [-o offset]
	          [-s[ch]] [-w width] [-] [file ...]
	diff: subsidiary pr failed

Well, I tracked it down to two problems.  When invoking pr, diff (util.c) 
uses the "-f" option for a formfeed instead of the now needed "-F" and 
diff.h defines PR_FILE_NAME to "/bin/pr".

The following patch (as of the March 15th current) fixes the problem.

Yeah, kind of a long mail for a simple problem, but I figure too much info
is better than not enough.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark P. Gooderum                           USSnail:  Aggregate Computing, Inc.
Software Engineer                                    300 So. Hiway 169 Ste 400
  "Working hard to be hardly working..."             Minneapolis, MN 55426
EMail:       mark@aggregate.com            Voice:    (612) 546-5579 
Interactive: mark@jupiter.aggregate.com    Fax:      (612) 546-9485
	     mark@sol.aggregate.com	   Sales/Sup:(800) 966-1666
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

*** diff.h.install	Thu Mar 17 20:45:18 1994
--- diff.h	Thu Mar 17 20:47:11 1994
***************
*** 23,29 ****
  #include "regex.h"
  
  #ifndef PR_FILE_NAME
! #define PR_FILE_NAME "/bin/pr"
  #endif
  
  #define TAB_WIDTH 8
--- 23,29 ----
  #include "regex.h"
  
  #ifndef PR_FILE_NAME
! #define PR_FILE_NAME "/usr/bin/pr"
  #endif
  
  #define TAB_WIDTH 8
*** util.c.install	Thu Mar 17 20:46:01 1994
--- util.c	Thu Mar 17 20:46:53 1994
***************
*** 205,211 ****
	      close (pipes[0]);
	    }
  
!	  execl (PR_FILE_NAME, PR_FILE_NAME, "-f", "-h", name, 0);
	  pfatal_with_name (PR_FILE_NAME);
	}
	else
--- 205,211 ----
	      close (pipes[0]);
	    }
  
!	  execl (PR_FILE_NAME, PR_FILE_NAME, "-F", "-h", name, 0);
	  pfatal_with_name (PR_FILE_NAME);
	}
	else


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