LinuxQuestions.org - stdio.h: No such file or directory. file is missing during gcc complile.

I have looked at the other threads and found nothing
which pertains to my issue.

I am using an older version of Debian 4.0 I cannot upgrade until I have a 2nd server running.

here is my problem. I lost the 4.0 installation
disks. During an apt-get install i did, I foolishly changed sources.list to other sources on the net which changed dependancies and removed needed packages, such as perlmagick, Crypt-SSLeay, aptitude, and possibly
the glibc - ( my current glibc was changed to glic6)

Since I have found my original 4.0 disk. restored the
sources.list. ran an update. and restored many of the packages that were removed. ( a big lesson to me I will never do that again)

here is a simple program:
#include <stdio.h>

when i run a gcc or i use cc compile
I get this message: "stdio.h": No such file or directory found.

Yes i know i missing the file stdio.h. I have looked
in /usr/include /usr/lib nothing.

apparently during my mistake the system installed the
glibc6 and removed the "stdio.h" file and other dependancies.

I would like to get back to where as was in terms of the glibc version i had. Aptitude currently shows the following packages that are available to me

Code:

DEB1:/etc# aptitude search glibc

v  glibc-2.3.6-2                                                                        -

v  glibc-2.3.6.ds1-1                                                                    -

p  glibc-doc                                                                            - GNU C Library: Documentation

v  glibc-pic                                                                            -

p  libg++2.8.1.3-glibc2.2                                                                - The GNU C++ extension library - runtime version

p  libstdc++2.10-glibc2.2                                                                - The GNU stdc++ library

DEB1:/etc#

the question is which one should i install, to get my "stdio.h" back again?

would i have to uninstall glibc6 first?
uninstalling glibc6 displays a big warning

Is there a way I can download just the "stdio.h"
files?

Please someone advise all options.

thx