Only in src.old: bind.c.orig
diff -ur src.old/char.c src/char.c
--- src.old/char.c	Sun Nov 19 03:09:20 1995
+++ src/char.c	Tue Jun  9 23:35:26 1998
@@ -142,14 +142,14 @@
 		lowcase[index] = index ^ DIFCASE;
 		upcase[index ^ DIFCASE] = index;
 	}
-#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVIION
+#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVIION || OPENBSD
 	/* and for those international characters! */
 	for (index = (unsigned char)'\340';
 	     index <= (unsigned char)'\375'; index++) {
 		lowcase[index] = index ^ DIFCASE;
 		upcase[index ^ DIFCASE] = index;
 	}
-#endif /*  BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVIION */
+#endif /*  BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVIION || OPENBSD */
 
 #if	MSDOS
 	/* setup various extended IBM-PC characters */
diff -ur src.old/dolock.c src/dolock.c
--- src.old/dolock.c	Sun Nov 19 03:09:20 1995
+++ src/dolock.c	Tue Jun  9 23:35:38 1998
@@ -53,8 +53,8 @@
 }
 #endif
 
-#if	FILOCK && (MSDOS || WINNT || OS2 || SUN || USG || AIX || AUX || AVIION || BSD || FREEBSD || HPUX8 || HPUX9 || AMIGA)
-#if	OS2 || ((MSDOS || WINNT) && MSC) || BSD || FREEBSD
+#if	FILOCK && (MSDOS || WINNT || OS2 || SUN || USG || AIX || AUX || AVIION || BSD || FREEBSD || HPUX8 || HPUX9 || AMIGA || OPENBSD)
+#if	OS2 || ((MSDOS || WINNT) && MSC) || BSD || FREEBSD || OPENBSD
 #include	<sys/types.h>
 #endif
 #include	<sys/stat.h>
diff -ur src.old/file.c src/file.c
--- src.old/file.c	Sat Nov 18 16:36:58 1995
+++ src/file.c	Tue Jun  9 23:36:55 1998
@@ -11,7 +11,7 @@
 #include	"eproto.h"
 #include	"edef.h"
 #include	"elang.h"
-#if	BSD | FREEBSD | SUN | USG | AIX
+#if	BSD || FREEBSD || SUN || USG || AIX || OPENBSD
 #include	<sys/types.h>
 #include	<sys/stat.h>
 #endif
@@ -323,7 +323,7 @@
 	}
 	ffclose();				/* Ignore errors.	*/
 
-#if	BSD || FREEBSD || USG || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVION
+#if	BSD || FREEBSD || USG || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || AVION || OPENBSD
 	/* if we don't have write priviledges, make this in VIEW mode */
 	if (s !=FIOERR && s != FIOFNF) {
 		if (access(fname, 2 /* W_OK*/) != 0)
@@ -428,7 +428,7 @@
 	while (cp1!=&fname[0] && cp1[-1]!=':' && cp1[-1]!='\\'&&cp1[-1]!='/')
 		--cp1;
 #endif
-#if	USG | AIX | AUX | SMOS | HPUX8 | HPUX9 | BSD | FREEBSD | SUN | XENIX | AVIION
+#if	USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || BSD || FREEBSD || SUN || XENIX || AVIION || OPENBSD
 	while (cp1!=&fname[0] && cp1[-1]!='/')
 		--cp1;
 #endif
@@ -600,7 +600,7 @@
 	int sflag;		/* are we safe saving? */
 	char tname[NSTRING];	/* temporary file name */
 	char buf[NSTRING];	/* message buffer */
-#if	BSD | FREEBSD | SUN | XENIX | USG | AIX
+#if	BSD || FREEBSD || SUN || XENIX || USG || AIX || OPENBSD
 	struct stat st;		/* we need info about the file permisions */
 #endif
 
@@ -680,14 +680,14 @@
 			strcat(buf, "s");
 
 		if (sflag) {
-#if	BSD | FREEBSD | SUN | XENIX | USG | AIX
+#if	BSD || FREEBSD || SUN || XENIX || USG || AIX || OPENBSD
 			/* get the permisions on the original file */
 			stat(fn, &st);
 #endif
 			/* erase original file */
 			/* rename temporary file to original name */
 			if (unlink(fn) == 0 && rename(tname, fn) == 0) {
-#if	BSD | FREEBSD | SUN | XENIX | USG | AIX
+#if	BSD || FREEBSD || SUN || XENIX || USG || AIX || OPENBSD
 				chown(fn, (int)st.st_uid, (int)st.st_gid);
 				chmod(fn, (int)st.st_mode);
 #else
diff -ur src.old/fileio.c src/fileio.c
--- src.old/fileio.c	Sun Nov 19 03:09:22 1995
+++ src/fileio.c	Tue Jun  9 23:37:40 1998
@@ -106,7 +106,7 @@
 	putc(26, ffp);		/* add a ^Z at the end of the file */
 #endif
 	
-#if     USG | AIX | AUX | SMOS | HPUX8 | HPUX9 | SUN | XENIX | BSD || FREEBSD | WMCS | VMS | (MSDOS & (LATTICE | MSC | TURBO | IC | ZTC)) | WINNT | OS2 | (TOS & MWC) | AVIION
+#if     USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || BSD || FREEBSD || OPENBSD || WMCS || VMS || (MSDOS && (LATTICE || MSC || TURBO || IC || ZTC)) || WINNT || OS2 || (TOS && MWC) || AVIION
         if (fclose(ffp) != FALSE) {
                 mlwrite(TEXT156);
 /*                      "Error closing file" */
diff -ur src.old/input.c src/input.c
--- src.old/input.c	Fri Dec 29 19:10:12 1995
+++ src/input.c	Tue Jun  9 23:38:44 1998
@@ -47,7 +47,7 @@
 #include	"edef.h"
 #include	"elang.h"
 
-#if USG | AIX | AUX | BSD | FREEBSD | SUN | HPUX8 | HPUX9
+#if USG || AIX || AUX || BSD || FREEBSD || SUN || HPUX8 || HPUX9 || OPENBSD
 #include	<pwd.h>
 extern struct passwd *getpwnam();
 #endif
@@ -244,7 +244,7 @@
 	char *ptr;		/* string pointer */
 	char user_name[NSTRING]; /* user name for directory */
 	static char buf[NSTRING];/* buffer to hold tentative name */
-#if USG | AIX | AUX | BSD | FREEBSD | SUN | HPUX8 | HPUX9
+#if USG || AIX || AUX || BSD || FREEBSD || SUN || HPUX8 || HPUX9 || OPENBSD
 	struct passwd *pwd;	/* password structure */
 #endif
 
@@ -353,7 +353,7 @@
 				--ttcol;
 			}
 
-#if USG | AIX | AUX | BSD | FREEBSD | SUN | HPUX8 | HPUX9
+#if USG || AIX || AUX || BSD || FREEBSD || SUN || HPUX8 || HPUX9 || OPENBSD
 			/* lookup someone else's home directory! */
 			if (user_name[0] != 0) {
 				pwd = getpwnam(user_name);
diff -ur src.old/keyboard.c src/keyboard.c
--- src.old/keyboard.c	Sat Nov 18 16:36:58 1995
+++ src/keyboard.c	Tue Jun  9 23:38:51 1998
@@ -224,7 +224,7 @@
 #endif
 #endif
 
-#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS) || (VMS && SMG) || MPE
+#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS) || (VMS && SMG) || MPE || OPENBSD
 
 #define NKEYSEQ		300		/* Number of keymap entries	*/
 
diff -ur src.old/lock.c src/lock.c
--- src.old/lock.c	Tue Jun  9 22:59:50 1998
+++ src/lock.c	Tue Jun  9 23:33:21 1998
@@ -15,7 +15,7 @@
 #include <sys/param.h>
 #endif
 
-#if	BSD || FREEBSD || WMCS || SUN || XENIX || HPUX8 || HPUX9 || AVIION || USG || AIX || AUX
+#if	BSD || FREEBSD || WMCS || SUN || XENIX || HPUX8 || HPUX9 || AVIION || USG || AIX || AUX || OPENBSD
 #include <sys/errno.h>
 #if !(defined(BSD) && (BSD >= 199103))
 extern int sys_nerr;		/* number of system error messages defined */
@@ -165,7 +165,7 @@
 
 	strcpy(obuf, errstr);
 	strcat(obuf, " - ");
-#if	BSD || FREEBSD || WMCS || SUN || XENIX || HPUX8 || HPUX9 || AVIION || USG || AIX || AUX
+#if	BSD || FREEBSD || WMCS || SUN || XENIX || HPUX8 || HPUX9 || AVIION || USG || AIX || AUX || OPENBSD
 	if (errno < sys_nerr)
 		strcat(obuf, sys_errlist[errno]);
 	else
Only in src.old: lock.c.orig
diff -ur src.old/unix.c src/unix.c
--- src.old/unix.c	Sat Nov 18 16:36:58 1995
+++ src/unix.c	Tue Jun  9 23:34:23 1998
@@ -81,7 +81,7 @@
 }
 
 /** Only compile for UNIX machines **/
-#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS)
+#if BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS) || OPENBSD
 
 /** Include files **/
 #include "eproto.h"			/* Function definitions		*/
@@ -98,7 +98,7 @@
 #include <sys/ioctl.h>			/* I/O control definitions	*/
 
 /** Additional include files **/
-#if	FREEBSD
+#if	FREEBSD || OPENBSD
 #define TERMIOS 1
 #include <sys/time.h>
 #undef	BSD
@@ -109,9 +109,9 @@
 #if (BSD && !TERMIOS)
 #include <sys/time.h>			/* Timer definitions		*/
 #endif /* (BSD && !TERMIOS) */
-#if BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) || AIX
+#if BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) || AIX || OPENBSD
 #include <signal.h>			/* Signal definitions		*/
-#endif /* BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) */
+#endif /* BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) || OPENBSD */
 #if USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX
 #include <termio.h>			/* Terminal I/O definitions	*/
 #endif /* USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX */
@@ -126,7 +126,7 @@
 
 /** Completion include files **/
 /** Directory accessing: Try and figure this out... if you can! **/
-#if ((BSD || FREEBSD) && !TERMIOS)
+#if ((BSD || FREEBSD || OPENBSD) && !TERMIOS)
 #include <sys/dir.h>			/* Directory entry definitions	*/
 #define DIRENTRY	direct
 #endif /* (BSD && !TERMIOS) */
@@ -485,7 +485,7 @@
 /** Close terminal device **/
 int ttclose()
 {
-#if ((AIX == 0) && (TERMIOS == 0)) || (FREEBSD == 1)
+#if ((AIX == 0) && (TERMIOS == 0)) || FREEBSD || OPENBSD
 	/* Restore original terminal modes */
 	if (reset != (char*)NULL)
 		write(1, reset, strlen(reset));
@@ -1202,7 +1202,7 @@
 	return(0);
 }
 
-#if BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS)
+#if BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) || OPENBSD
 /* Surely more than just BSD systems do this */
 
 /** Perform a stop signal **/
@@ -1225,7 +1225,7 @@
 	return(0);
 }
 
-#endif /* BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) */
+#endif /* BSD || FREEBSD || SUN || HPUX8 || HPUX9 || (AVVION || TERMIOS) || OPENBSD */
 
 /** Get time of day **/
 char * timeset()
@@ -1327,9 +1327,9 @@
 	/* Get shell path */
 	sh = getenv("SHELL");
 	if (!sh)
-#if BSD || FREEBSD || SUN
+#if BSD || FREEBSD || SUN || OPENBSD
 		sh = "/bin/csh";
-#endif /* BSD || FREEBSD || SUN */
+#endif /* BSD || FREEBSD || SUN || OPENBSD */
 #if USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || XENIX || (AVVION || TERMIOS)
 		sh = "/bin/sh";
 #endif /* USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || XENIX || (AVVION || TERMIOS) */
@@ -1726,4 +1726,4 @@
 }
 #endif
 
-#endif /* BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS) */
+#endif /* BSD || FREEBSD || USG || AIX || AUX || SMOS || HPUX8 || HPUX9 || SUN || XENIX || (AVVION || TERMIOS) || OPENBSD */