--- mandoc-1.14.5/dbm.c.orig	Sat Jan 25 20:09:04 2020
+++ mandoc-1.14.5/dbm.c	Sat Jan 25 20:09:16 2020
@@ -31,7 +31,7 @@
 #include <err.h>
 #endif
 #include <errno.h>
-#include <regex.h>
+#include <pcre2posix.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>