diff -Naur old/doc/doxyparse.pl new/doc/doxyparse.pl
--- old/doc/doxyparse.pl	2014-01-11 06:04:41.000000000 +0900
+++ new/doc/doxyparse.pl	2015-08-08 22:29:34.216889652 +0900
@@ -273,7 +273,7 @@
 
 	print MAN $MAN_MIDDLE;
 
-	if (defined(@$also)) {
+	if (@$also) {
 		print MAN "\n.SH SEE ALSO\n\\fI";
 		print MAN join "\\fR, \\fI", @$also;
 		print MAN "\\fR.\nAnd ";