--- mandoc-1.14.5/dba_read.c.orig	Sat Jan 25 20:11:14 2020
+++ mandoc-1.14.5/dba_read.c	Sat Jan 25 20:11:22 2020
@@ -19,7 +19,7 @@
  * The interface is defined in "dba.h".
  * This file is seperate from dba.c because this also uses "dbm.h".
  */
-#include <regex.h>
+#include <pcre2posix.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>