diff -uNr bftpd/options.c bftpd.mod/options.c
--- bftpd/options.c	2017-09-30 03:18:31.000000000 +0300
+++ bftpd.mod/options.c	2020-01-19 17:33:04.566591884 +0200
@@ -13,7 +13,7 @@
 
 struct global config_global;
 struct group_of_users *config_groups;
-struct user *config_users;
+struct bftpd_user *config_users;
 
 /*
 Returns NULL on error. May return
@@ -183,7 +183,7 @@
 	FILE *configfile;
 	char *str;
     struct group_of_users *grp = NULL;
-    struct user *usr = NULL;
+    struct bftpd_user *usr = NULL;
     config_global.options = NULL;
     config_global.directories = NULL;
 	if (!configpath)
@@ -209,9 +209,9 @@
                 create_options(configfile, &(config_global.options), &(config_global.directories));
             } else if (strstr(str, "user ") == str) {
                 if (usr) {
-                    usr = usr->next = calloc(1, sizeof(struct user));
+                    usr = usr->next = calloc(1, sizeof(struct bftpd_user));
                 } else {
-                    config_users = usr = calloc(1, sizeof(struct user));
+                    config_users = usr = calloc(1, sizeof(struct bftpd_user));
                 }
                 /* avoid memory errors */
                 if (! usr)
@@ -349,7 +349,7 @@
 char *getoption_user(char *name)
 {
     char *result;
-    struct user *usr;
+    struct bftpd_user *usr;
     if ((usr = config_users)) {
         do {
             if (!strcmp(user, usr->name)) {
diff -uNr bftpd/options.h bftpd.mod/options.h
--- bftpd/options.h	2012-11-08 20:33:35.000000000 +0200
+++ bftpd.mod/options.h	2020-01-19 17:32:28.686276802 +0200
@@ -48,15 +48,15 @@
     struct directory *directories;
     struct group_of_users *next;
 };
-struct user {
+struct bftpd_user {
     char *name;
     struct bftpd_option *options;
     struct directory *directories;
-    struct user *next;
+    struct bftpd_user *next;
 };
 
 extern struct group_of_users *config_groups;
-extern struct user *config_users;
+extern struct bftpd_user *config_users;
 
 void expand_groups();
 void config_init();