https://devzone.nordicsemi.com/f/nordic-q-a/16713/how-to-define-ble_stack_support_reqd-macroHi All, I am using nrf51822 with S130 softdevice &amp; SDK12 i am using Eclips IDE for development. i am defining BLE_STACK_SUPPORT_REQD in makefile by CFLAGS += -DBLE_STACK_SUPPORT_REQD but it is not linking in my project and because of thaten-USTelligent Community 13Wed, 30 Nov 2016 15:02:43 GMThttps://devzone.nordicsemi.com/thread/63930?ContentTypeID=1Wed, 30 Nov 2016 15:02:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0eba091d-15da-41c7-8126-2cae0068e9b0bjorn-spockeli<p>Hi Shanky,</p> <p>I suggest that you take a look at our <a href="https://devzone.nordicsemi.com/tutorials/7/">Development with GCC and Eclipse</a> tutorial, specifically towards the end of the <em>&quot;Enable auto discovery of symbols, include paths and compiler settings&quot;</em> section.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>