How to generate /usr/share/syslinux/{mbr.bin,ldlinux.c32} from scratch?

Today, I have built isolinux from source code (git://repo.or.cz/syslinux.git) using command

make bios efi64 installer

During the building, I got some errors. For these errors, I must copy /usr/share/syslinux/{mbr.bin,ldlinux.c32...} to the appropriate directories. Now I am curious how these files such as mbr.bin and ldlinux.c32 are built from scratch？ Any advice will be appreciated!