make[2]: *** [arch/x86/boot/compressed/Makefile:146: arch/x86/boot/compressed/vmlinux.bin.zst] Error 127 make[2]: *** Deleting file 'arch/x86/boot/compressed/vmlinux.bin.zst' make[1]: *** [arch/x86/boot/Makefile:116: arch/x86/boot/compressed/vmlinux] Error 2 make: *** [arch/x86/Makefile:282: bzImage] Error 2 sol: [root@fedora linux-6.4.2]# dnf install zstd

make[2]: *** [arch/x86/boot/compressed/Makefile:146: arch/x86/boot/compressed/vmlinux.bin.zst] Error 127 make[2]: *** Deleting file 'arch/x86/boot/compressed/vmlinux.bin.zst' make[1]: *** [arch/x86/boot/Makefile:116: arch/x86/boot/compressed/vmlinux] Error 2 make: *** [arch/x86/Makefile:282: bzImage] Error 2 sol: [root@fedora linux-6.4.2]# dnf install zstd

int main represents that the function returns some integer even ‘0’ at the end of the program execution.’0’ represents the successful execution of a program int main(void) represents that the function takes NO argument.