Hi, Trying to compile simple hello world C file with a cross compiler and getting the below issues. C File: #include<stdio.h> int main() { printf("Hello! This is a test prgoram.\n"); return 0; } Error: /home /zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-sbrkr.o): in function `_sbrk_r': sbrkr.c:(.text._sbrk_r+0x22): undefined reference to `sbrk' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-writer.o): in function `_write_r': writer.c:(.text._write_r+0x32): undefined reference to `write' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-closer.o): in function `_close_r': closer.c:(.text._close_r+0x1f): undefined reference to `close' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-lseekr.o): in function `_lseek_r': lseekr.c:(.text._lseek_r+0x30): undefined reference to `lseek' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-readr.o): in function `_read_r': readr.c:(.text._read_r+0x32): undefined reference to `read' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-fstatr.o): in function `_fstat_r': fstatr.c:(.text._fstat_r+0x2a): undefined reference to `fstat' /home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/bin/../lib/gcc/x86_64-zephyr-elf/9.2.0/../../../../x86_64-zephyr-elf/bin/ld: /home/syerabol/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib/libc.a(lib_a-isattyr.o): in function `_isatty_r': isattyr.c:(.text._isatty_r+0x1f): undefined reference to `isatty' collect2: error: ld returned 1 exit status Tried below flags but issue is not resolved. Flags tried --entry main -Werror=implicit-function-declaration --sysroot=/home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib -isysroot=/home /zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/include -iquote/home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/include -L/home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/lib -isystem/home/zephyr-sdk-0.11.3/x86_64-zephyr-elf/x86_64-zephyr-elf/include Any help on how to resolve this issue would be great. Thank You, Spoorthy Priya Yerabolu.