aports

 1On Alpine, apropos(1) is available in a separate subpackages and not
 2installed by default. For this reason, having this warning enabled by
 3default does not make much sense since we don't use mandoc.db by
 4default.
 5
 6diff -upr a/main.c b/main.c
 7--- a/main.c	2021-09-19 18:21:40.000000000 +0200
 8+++ b/main.c	2021-09-19 19:40:28.711594083 +0200
 9@@ -822,8 +822,6 @@ fs_lookup(const struct manpaths *paths,
10 	return globres;
11 
12 found:
13-	warnx("outdated mandoc.db lacks %s(%s) entry, run %s %s",
14-	    name, sec, BINM_MAKEWHATIS, paths->paths[ipath]);
15 	if (res == NULL)
16 		free(file);
17 	else if (file == NULL)