You need to install the cross-compiling tools with make tools.

You can then make kernel to make the kernel, or make iso to make a bootable ISO. You can also make boot and make multiboot to boot these in QEMU, respectively.

make debug

Basic dependencies:

• nasm (To compile assembly)
• gcc (To compile C)
• make (To make!)

To emulate booting:

• qemu

To create a bootable ISO:

• mtools
• libburniso

To debug:

• gdb