diff -Nuar lzop-1.00/src/lzop.c lzop-1.00patch/src/lzop.c
--- lzop-1.00/src/lzop.c	Mon Apr 27 09:10:59 1998
+++ lzop-1.00patch/src/lzop.c	Fri Mar  8 14:26:50 2002
@@ -2036,7 +2036,6 @@
 
 	if (opt_stdin)
 	{
-		opt_unlink = 0;
 #if 0
 		/* gzip: always use stdout */
 		opt_stdout = 1;
@@ -2068,8 +2067,12 @@
 	}
 
 	/* check number of remaining args */
+	if (opt_stdin == STDIN_GUESSED && i != argc) /* if guessed stdin and args remaining, we guessed wrong. */ 
+		opt_stdin = 0; 
+
 	if (opt_stdin)
 	{
+		opt_unlink = 0;
 		if (opt_cmd == CMD_COMPRESS && opt_output_path)
 		{
 			fprintf(stderr,"%s: cannot use `-p' when compressing stdin\n",argv0);
@@ -2621,7 +2624,7 @@
 	/* accept "-" as synonym for stdin */
 	for (i = mfx_optind; i < argc; i++)
 		if (strcmp(argv[i],"-") == 0)
-			opt_stdin = 1;
+			opt_stdin = STDIN_REQUESTED;   /* explicitly requested to use stdin.  OK. */
 	while (mfx_optind < argc && strcmp(argv[mfx_optind],"-") == 0)
 		mfx_optind++;
 
@@ -2803,7 +2806,9 @@
 #endif
 
 	set_term(stderr);
-	opt_stdin = isafile(STDIN_FILENO);
+
+	/* GUESS if we want to use stdin.  Will be double checked later. */
+	opt_stdin = (isafile(STDIN_FILENO) ? STDIN_GUESSED : opt_stdin); 
 
 	UNUSED(foreground);
 #ifdef SIGINT
@@ -2885,7 +2890,7 @@
 		{
 			set_cmd(CMD_DECOMPRESS);
 			if (i == argc)
-				opt_stdin = 1;
+				opt_stdin = STDIN_REQUESTED;  /* explicitly set this, even though in if 0 preprocessor block.*/ 
 			if (!opt_output_name)
 				opt_stdout = 1;
 			break;
diff -Nuar lzop-1.00/src/lzop.h lzop-1.00patch/src/lzop.h
--- lzop-1.00/src/lzop.h	Wed Apr 15 13:47:11 1998
+++ lzop-1.00patch/src/lzop.h	Fri Mar  8 14:22:18 2002
@@ -311,6 +311,8 @@
 #define STDERR_NAME		"<stderr>"
 #define UNKNOWN_NAME	"<unknown>"
 
+#define STDIN_GUESSED   1
+#define STDIN_REQUESTED 2
 
 /*************************************************************************
 //