commit 9089291006a4258c39c75a920ad536b61504251a
Author: rnhmjoj <rnhmjoj@inventati.org>
Date:   Fri May 1 19:32:15 2020 +0200

    check for systemwide man_db.conf before the bundled one

diff --git a/src/manp.c b/src/manp.c
index 5441339..0bbf566 100644
--- a/src/manp.c
+++ b/src/manp.c
@@ -841,18 +841,24 @@ void read_config_file (bool optional)
 	}
 
 	if (getenv ("MAN_TEST_DISABLE_SYSTEM_CONFIG") == NULL) {
-		config_file = fopen (CONFIG_FILE, "r");
+		const char *config_filepath;
+		if (access ("/etc/man_db.conf", F_OK) != -1) {
+			config_filepath = "/etc/man_db.conf";
+		} else {
+			config_filepath = CONFIG_FILE;
+		}
+		config_file = fopen (config_filepath, "r");
 		if (config_file == NULL) {
 			if (optional)
 				debug ("can't open %s; continuing anyway\n",
-				       CONFIG_FILE);
+				       config_filepath);
 			else
 				error (FAIL, 0,
 				       _("can't open the manpath "
 					 "configuration file %s"),
-				       CONFIG_FILE);
+				       config_filepath);
 		} else {
-			debug ("From the config file %s:\n", CONFIG_FILE);
+			debug ("From the config file %s:\n", config_filepath);
 
 			add_to_dirlist (config_file, 0);
 			fclose (config_file);