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Depending on the OS/libc, device macros are defined in different headers. This change ensures we include the right one. sys/types.h - BSD sys/mkdev.h - Sun sys/sysmacros.h - glibc (Linux) glibc currently pulls sys/sysmacros.h into sys/types.h, but this may change in a future release. https://sourceware.org/ml/libc-alpha/2015-11/msg00253.html
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'