ADDING TO GCC'S INCLUDE SEARCH PATHS?

[Doug Lawlor]

Hello list, I need to know how I go about adding to the search paths
where gcc looks for include files.  As far as I can tell it currently
looks in '/usr/include' and '/usr/local/include'.  I would also like to
have the compiler look in '/opt/gnome/include' and '/opt/kde/include'.
How do I make this happen?  

Thanks in advance,  

Doug

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Doug Lawlor <dlawlor at roadrunner.nf.net>