External Mode in Custom Soc

Is there a way my custom soc can have axi4 interface? I created the external mode followiing the guideline here:

https://www.mathworks.com/help/supportpkg/armcortexm/ug/activate-the-external-mode-feature-1.html

But it does not include how to enable axi4 interface. When I try to build code for the SOC, it throws the following error:

"C:/PROGRA~3/MATLAB/SUPPOR~1/R2020b/3P778C~1.INS/LINARO~1.INS/bin/arm-linux-gnueabihf-gcc" -lm -lrt -lpthread -ldl -o ../gm_hdl_adc_new_interface.elf gm_hdl_adc_new_interface.c.o gm_hdl_adc_new_interface_data.c.o ext_svr.c.o updown.c.o ext_work.c.o mem_mgr.c.o rtiostream_utils.c.o linuxinitialize.c.o rtiostream_interface.c.o rtiostream_tcpip.c.o ert_main.c.o -lm -lm gm_hdl_adc_new_interface.c.o: In function `gm_hdl_adc_new_interface_step': gm_hdl_adc_new_interface.c:(.text+0x22): undefined reference to `axi4Write' gm_hdl_adc_new_interface.c:(.text+0x3c): undefined reference to `axi4Write' gm_hdl_adc_new_interface.c.o: In function `gm_hdl_adc_new_interface_initialize': gm_hdl_adc_new_interface.c:(.text+0x3d8): undefined reference to `resetIPCore' gm_hdl_adc_new_interface.c:(.text+0x420): undefined reference to `axi4Init' gm_hdl_adc_new_interface.c:(.text+0x482): undefined reference to `axi4Init' gm_hdl_adc_new_interface.c.o: In function `gm_hdl_adc_new_interface_terminate': gm_hdl_adc_new_interface.c:(.text+0x4fa): undefined reference to `axi4Terminate' gm_hdl_adc_new_interface.c:(.text+0x542): undefined reference to `axi4Terminate'