-for a in usr/lib/grub/i386-pc/{*.mod,efiemu??.o,command.lst,moddep.lst,fs.lst,handler.lst,parttool.lst}; do \
+if ./usr/bin/grub-mkimage --help | grep -q -- --format ; then
+ ./usr/bin/grub-mkimage -d usr/lib/grub/*-pc -o core.img biosdisk iso9660 --format=i386-pc
+else
+ ./usr/bin/grub-mkimage -d usr/lib/grub/*-pc -o core.img biosdisk iso9660
+fi
+
+for a in usr/lib/grub/*-pc/{*.mod,efiemu??.o,command.lst,moddep.lst,fs.lst,handler.lst,parttool.lst}; do \