Index: include/ntop_defines.h
--- include/ntop_defines.h.orig
+++ include/ntop_defines.h
@@ -197,7 +197,7 @@
 #define MAX_NUM_QUEUED_ADDRS    500 /* Maximum number of queued address for resolution */
 #define MAX_NUM_QUEUED_CONTACTS 25000
 #define NTOP_COPYRIGHT          "(C) 1998-22 ntop.org"
-#define DEFAULT_PID_PATH        "/var/run/ntopng.pid"
+#define DEFAULT_PID_PATH        "/var/run/ntopng/ntopng.pid"
 #define SYSTEM_INTERFACE_NAME   "__system__"
 #define SYSTEM_INTERFACE_ID     -1
 #define INVALID_INTERFACE_ID    -2
@@ -517,11 +517,15 @@
 #endif
 #define CONST_DEFAULT_USERS_FILE     "ntopng-users.conf"
 #define CONST_DEFAULT_INSTALL_DIR    (DATA_DIR "/ntopng")
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 #define CONST_BIN_DIR                "/usr/local/bin"
 #define CONST_SHARE_DIR              "/usr/local/share"
 #define CONST_SHARE_DIR_2            "/usr/share"
+#ifdef __FreeBSD__
 #define CONST_ETC_DIR                "/usr/local/etc"
+#else
+#define CONST_ETC_DIR                "/etc"
+#endif
 #define CONST_DEFAULT_DATA_DIR       "/var/db/ntopng"
 #else
 #define CONST_BIN_DIR                "/usr/bin"