kernel config question.

[James]

I am reading the README from the kernel file. under INSTALLING the kernel:
it mentions that 

- make sure your /usr/include/asm, /usr/include/linux, and /usr/include/scsi
   directories are just symlinks to the kernel sources:

		cd /usr/include
		rm -rf asm linux scsi
		ln -s /usr/src/linux/include/asm-i386 asm
		ln -s /usr/src/linux/include/linux linux
		ln -s /usr/src/linux/include/scsi scsi


is this necessary ? i did it without backup the original directories( which i am now regret ).
then i got error while trying to compile the procps(the ps package). the error is 

In file included from /usr/include/linux/errno.h:4,
                 from /usr/include/bits/errno.h:25,
                 from /usr/include/errno.h:36,
                 from proc/ksym.c:17:
/usr/include/asm/errno.h:4: asm-generic/errno.h: No such file or directory


this is  debian 3.0. kernel 2.2.20-idepci.   

what should i do now ?

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