Query on /usr/lib/gcc-lib/ directory

Hi Guys,

I just had a query on  /usr/lib/gcc-lib/  directory.  This directory 
seems to contain the redhat-version subdirectory and then all the 
subdirectories for each compiler installed. What is the significance of 
this directory ?  Is this directory automatically created at the time of 
installation or has to be manually created ?

I have an issue with 2 of my machines :

1] M/C 1 has  Red Hat Enterprise Linux WS release 3 (Taroon Update 4) ) 
and gcc 3.2.2 . This machine has got a proper directory  and include files
for the compiler 3.2.3 under  the directory : 
/usr/lib/gcc-lib/i386-redhat-linux

2] M/C 2 has   ( Red Hat Enterprise Linux AS release 4 (Nahant) ) and 
gcc 3.4.3.
*This machine however does not have such directory and the respective 
include files under the directory  */usr/lib/gcc-lib/i386-redhat-linux/
I had expected a  3.4.3/include directory under the  
/usr/lib/gcc-lib/i386-redhat-linux/  directory .

Do you think that there is some problem with the installation regrding 
this ? I am facing some undefined macro error and was thinking if that 
error could be related to the missing directory and its include files on 
M/C 2.

Thanks,
--
Tushar Telichari
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Geek by nature, Linux by choice!