diff --git a/Examples/src/adctest.c b/Examples/src/adctest.c
index 6d0f0c9..9bc5e88 100644
--- a/Examples/src/adctest.c
+++ b/Examples/src/adctest.c
@@ -31,7 +31,7 @@ int putchar(int c)
   return (c);
 }
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   EASY_PDK_INIT_SYSCLOCK_8MHZ();                //use 8MHz sysclock
   EASY_PDK_USE_FACTORY_IHRCR_16MHZ()            //use factory IHCR tuning value (tuned for 8MHz SYSCLK @ 5.0V)
diff --git a/Examples/src/calib-and-fuse-demo.c b/Examples/src/calib-and-fuse-demo.c
index 0e7acd0..dd02d72 100644
--- a/Examples/src/calib-and-fuse-demo.c
+++ b/Examples/src/calib-and-fuse-demo.c
@@ -1,7 +1,7 @@
 #include <stdint.h>
 #include "easypdk/pdk.h"
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   //
   // F U S E S
@@ -16,7 +16,7 @@ unsigned char _sdcc_external_startup(void)
   //
   // C A L I B R A T I O N S
   //
-  // Calibrations should always be inserted in "_sdcc_external_startup()" function to ensure reachability at startup.
+  // Calibrations should always be inserted in "__sdcc_external_startup()" function to ensure reachability at startup.
   //
   // SYSCLK setup and calibration (Your application should use only one of the IHRC and/or ILRC setup and claibrations).
   
diff --git a/Examples/src/comptest.c b/Examples/src/comptest.c
index c49803f..d35e18a 100644
--- a/Examples/src/comptest.c
+++ b/Examples/src/comptest.c
@@ -37,7 +37,7 @@ int putchar(int c)
   return (c);
 }
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   EASY_PDK_INIT_SYSCLOCK_1MHZ();                //use 1MHz sysclock
   EASY_PDK_CALIBRATE_IHRC(1000000,5000);        //tune SYSCLK to 1MHz @ 5.000V
diff --git a/Examples/src/easypdk/pdk.h b/Examples/src/easypdk/pdk.h
index 4e5b494..90fa17d 100644
--- a/Examples/src/easypdk/pdk.h
+++ b/Examples/src/easypdk/pdk.h
@@ -6,6 +6,10 @@
 #error "SDCC 4.1.10 or newer is required"
 #endif
 
+#if(!(__SDCC_VER>=40211))
+#define __sdcc_external_startup _sdcc_external_startup
+#endif
+
 #if defined(PMS150C)
  #include "pms150c.h"
 #elif defined(PMS150G)
diff --git a/Examples/src/helloworld.c b/Examples/src/helloworld.c
index fa74eea..4d9b1d4 100644
--- a/Examples/src/helloworld.c
+++ b/Examples/src/helloworld.c
@@ -31,7 +31,7 @@ int putchar(int c)
   return (c);
 }
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   EASY_PDK_INIT_SYSCLOCK_8MHZ();                //use 8MHz sysclock
   EASY_PDK_CALIBRATE_IHRC(8000000,4000);        //tune SYSCLK to 8MHz @ 4.000V
diff --git a/Examples/src/helloworld_2cores.c b/Examples/src/helloworld_2cores.c
index f14ea14..675f85a 100644
--- a/Examples/src/helloworld_2cores.c
+++ b/Examples/src/helloworld_2cores.c
@@ -19,7 +19,7 @@ __asm__("                             \n\
         add a, #l_OSEG + 1            \n\
         and a, #0xfe                  \n\
         mov.io sp, a                  \n\
-        call __sdcc_external_startup  \n\
+        call ___sdcc_external_startup  \n\
         goto s_GSINIT                 \n\
         .area CODE                    \n");
 }
@@ -51,7 +51,7 @@ int putchar(int c)
   return (c);
 }
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   EASY_PDK_INIT_SYSCLOCK_8MHZ();                //use 8MHz sysclock
 //  EASY_PDK_USE_FACTORY_IHRCR_16MHZ();
diff --git a/Examples/src/helloworld_2mhz.c b/Examples/src/helloworld_2mhz.c
index 9f7d117..da6c62d 100644
--- a/Examples/src/helloworld_2mhz.c
+++ b/Examples/src/helloworld_2mhz.c
@@ -31,7 +31,7 @@ int putchar(int c)
   return (c);
 }
 
-unsigned char _sdcc_external_startup(void)
+unsigned char __sdcc_external_startup(void)
 {
   EASY_PDK_INIT_SYSCLOCK_2MHZ();                //use 2MHz sysclock
   EASY_PDK_CALIBRATE_IHRC(2000000,4000);        //tune SYSCLK to 2MHz @ 4.000V