default include path

[Nick Ioffe]

Hi!
WHen I use gcc without -I option it still uses some default path.

I always thought that it is /usr/include and /usr/local/include,
but in our site it uses some esoteric local settings.

Thus 2 questions?

1. How can I see these settings - is there any environment variable
   or some compile statement etc?
2. How can I override these definitions since my feeling is that
   -I option doesn't override but adds paths...


Sincerely, Nick