... it.¹

This option causes real functions to be used for tolower() and friends, instead of macros. The macros evaluate their arguments twice, where fdisk uses a call to an input function as argument to tolower().

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... programs:²

The BUILD_CC option specifies that we want to use the normal gcc for building a certain program that must be run on the host system. Otherwise it would be linked with uClibc and would not run.

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... system³

The initrd feature makes it possible to mount the root file system twice, once on the RAM disk loaded by the boot loader and once on another device (most likely a disk partition). The RAM disk can contain an initialization routine to load the required modules to mount the root disk. This two stage root file system feature is not used here.

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