--- catman.c.orig	2007-10-30 04:43:52.000000000 +0000
+++ catman.c	2007-10-30 04:45:35.000000000 +0000
@@ -403,6 +403,10 @@
 	dev_t src_dev;
 	ino_t src_ino;
 	const char *link_name;
+	struct stat err_st;
+	char err_file[MAXPATHLEN];
+	int err_fd;
+	char err_buf[1024];
 
 	src_test = test_path(src, &src_mtime);
 	if (!(src_test & (TEST_FILE|TEST_READABLE))) {
@@ -447,13 +451,33 @@
 	}
 	snprintf(tmp_file, sizeof tmp_file, "%s.tmp", cat);
 	snprintf(cmd, sizeof cmd,
-	    "%scat %s | tbl | nroff -T%s -man | col | %s > %s.tmp",
+	    "%scat %s | tbl | nroff -T%s -man 2>%s.err | col | %s > %s.tmp",
 	    zipped == BZIP ? BZ2CAT_CMD : zipped == GZIP ? GZCAT_CMD : "",
-	    src, nroff_device,
+	    src, nroff_device, cat,
 	    zipped == BZIP ? BZ2_CMD : zipped == GZIP ? GZ_CMD : "cat",
 	    cat);
 	if (system(cmd) != 0)
 		err(1, "formatting pipeline");
+
+	snprintf(err_file, sizeof err_file, "%s.err", cat);
+	if (stat(err_file, &err_st) < 0)
+		warn("%s", err_file);
+	else if (err_st.st_size > 0)
+	{
+		fprintf(stderr, "nroff formatting errors in %s:\n", src);
+		if ((err_fd = open(err_file, O_RDONLY)) < 0)
+			warn("%s", err_file);
+		else
+		{
+			while (read(err_fd, &err_buf, sizeof err_buf) > 0)
+				fprintf(stderr, "%s", err_buf);
+
+			close(err_fd);
+		}
+	}
+	if (unlink(err_file) < 0)
+		warn("%s", err_file);
+
 	if (rename(tmp_file, cat) < 0)
 		warn("%s", cat);
 	tmp_file[0] = '\0';