$NetBSD$

--- main.c.orig	2019-03-10 09:56:43.000000000 +0000
+++ main.c
@@ -122,10 +122,12 @@ main(int argc, char *argv[])
 	struct tag_files *tag_files;
 	struct manpage	*res, *resp;
 	const char	*progname, *sec, *thisarg;
+	const char	*errstr;
 	char		*conf_file, *defpaths, *auxpaths;
 	char		*oarg, *tagarg;
+	char		*width;
 	unsigned char	*uc;
-	size_t		 i, sz;
+	size_t		 i, sz, w;
 	int		 prio, best_prio;
 	enum outmode	 outmode;
 	int		 fd, startdir;
@@ -317,6 +319,15 @@ main(int argc, char *argv[])
 	    !isatty(STDOUT_FILENO))
 		use_pager = 0;
 
+	if (conf.output.width == 0) {
+		width = getenv("MANWIDTH");
+		if (width != NULL && *width != '\0') {
+			w = strtonum(width, 1, 1000, &errstr);
+			if (errstr == NULL)
+				conf.output.width = w;
+		}
+	}
+
 	if (use_pager &&
 	    (conf.output.width == 0 || conf.output.indent == 0) &&
 	    ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1 &&