diff -u ctm.1.orig ctm.1
--- ctm.1.orig  2011-08-10 17:04:53.000000000 -0500
+++ ctm.1       2011-08-10 17:06:01.000000000 -0500
@@ -52,8 +52,11 @@
 You can pass a CTM delta on stdin, or you can give the
 filename as an argument.
 If you do the latter, you make life a lot
-easier for your self, since the program can accept gzip'ed files and
+easier for your self, since the program can accept gzip'ed,
+bzip2'ed, or xz'ed files and
 since it will not have to make a temporary copy of your file.
+(If you pass it an xz'ed file, and xz is not part of your base system,
+you will have to install xz from the ports.)
 You can
 specify multiple deltas at one time, they will be processed one at a
 time.
diff -u ctm.c.orig ctm.c
--- ctm.c.orig	2011-08-10 17:15:30.000000000 -0500
+++ ctm.c	2011-08-10 17:19:23.000000000 -0500
@@ -211,6 +211,22 @@
 	strcat(p,filename);
 	f = popen(p,"r");
 	if(!f) { warn("%s", p); return Exit_Garbage; }
+    } else if(p && !strcmp(p,".bz2")) {
+	p = alloca(20 + strlen(filename));
+	strcpy(p,"bzcat < ");
+	strcat(p,filename);
+	f = popen(p,"r");
+	if(!f) { warn("%s", p); return Exit_Garbage; }
+    } else if(p && !strcmp(p,".xz")) {
+	if (system("which -s xz") != 0) {
+	    fprintf(stderr, "xz is not installed.  You can install it from ports.\n");
+	    return Exit_Garbage;
+	}
+	p = alloca(20 + strlen(filename));
+	strcpy(p,"xz -dc < ");
+	strcat(p,filename);
+	f = popen(p,"r");
+	if(!f) { warn("%s", p); return Exit_Garbage; }
     } else {
 	p = 0;
 	f = fopen(filename,"r");