Error trying to configure/add another gcc
 

I am trying to add another gcc in /usr/local for backward compatibility
current version is: gcc version 3.4.6 /usr/bin/gcc
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i want to keep that but install another one in the user local area.
Have downloaded the relevant source and am getting and config.h error per:
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~/gcc-2.2.2/configure prefix=/usr/local/gcc/2.2.2
../gcc-2.2.2/configure: cannot create a link `config.h',
since the file `config/xm-prefix=/usr/local/gcc/2.2.2.h' does not exist
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any known workarounds or fixes to get past this error will be great.

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Have found that it appears to be the gcc source - all except 2.95 will actually configure.
Prior to this each one either requires more arguments in the configure statement or the config.h cannot find a missing prefix file in the source.
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I found a good web site white paper on what to do:
http://www.tellurian.com.au/whitepapers/multiplegcc.php
this has a source link as well for older versions of gcc that can be built and installed to run alongside the current gcc
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so it is possible to do and not for all prior versions, unless you know how to overcome the errors. For me it is not that critical.