diff --git a/GorgonMeducer.perf_counter.pdsc b/GorgonMeducer.perf_counter.pdsc
index 54b5c00..842b0f9 100644
--- a/GorgonMeducer.perf_counter.pdsc
+++ b/GorgonMeducer.perf_counter.pdsc
@@ -297,6 +297,10 @@
                 <file category="sourceC"        name="template/perfc_port_user.c" attr="config"  version="1.0.2"/>
                 <file category="header"         name="template/perfc_port_user.h" attr="config"  version="1.0.2"/>
               </files>
+              <RTE_Components_h>
+
+#define __RTE_PERFC_PORTING_USER_DEFINED__ 1
+              </RTE_Components_h>
 
               <Pre_Include_Global_h>
 
diff --git a/systick_wrapper_gnu.s b/systick_wrapper_gnu.s
index 54182ce..b2e0ac6 100644
--- a/systick_wrapper_gnu.s
+++ b/systick_wrapper_gnu.s
@@ -14,6 +14,11 @@
 ;*  limitations under the License.                                           *
 ;*                                                                           *
 ;****************************************************************************/
+#if defined(_RTE_)
+#   include "RTE_Components.h"
+#endif
+
+#if !defined(__RTE_PERFC_PORTING_USER_DEFINED__)
 
 #if !__PERFC_CFG_DISABLE_DEFAULT_SYSTICK_PORTING__
     .syntax unified
@@ -43,4 +48,6 @@ $Sub$$SysTick_Handler:
 
 __ensure_systick_wrapper:
     bx      lr
+#endif
+
 #endif
\ No newline at end of file
diff --git a/template/perfc_port_user.c b/template/perfc_port_user.c
index 5f4a64a..8111c85 100644
--- a/template/perfc_port_user.c
+++ b/template/perfc_port_user.c
@@ -44,6 +44,24 @@
 /*============================ GLOBAL VARIABLES ==============================*/
 /*============================ LOCAL VARIABLES ===============================*/
 /*============================ PROTOTYPES ====================================*/
+/* low level interface for porting */
+extern
+uint32_t perfc_port_get_system_freq(void);
+extern
+int64_t perfc_port_get_system_timer_top(void);
+extern
+bool perfc_port_is_system_timer_ovf_pending(void);
+extern
+void perfc_port_init_system_timer(bool bTimerOccupied);
+extern
+int64_t perfc_port_get_system_timer_elapsed(void);
+extern
+void perfc_port_clear_system_timer_ovf_pending(void);
+extern
+void perfc_port_stop_system_timer_counting(void);
+extern
+void perfc_port_clear_system_timer_counter(void);
+
 /*============================ IMPLEMENTATION ================================*/
 /*============================ INCLUDES ======================================*/