Missing Libraries

[Abhijith-CB]

I am getting the above error when I am trying to compile an exmaple code for
west build -b rpi_pico samples/net/gsm_modem -- -DCONFIG_MODEM_GSM_APN=\"internet\".
Also I am not able to get the libraries that is nesessary to write new shell commands
for eg : zephyr/drivers/uart.h is missing and syscalls/uart.h is missing .