gcc path question!

[Fenglou Mao]

Dear Ulrich Drepper,
     Can you tell me how gcc(egcs1.1.1) to find the include files and
lib files?
     How the dynamic library is found?

Sincerely Yours,

FengLou Mao
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ADD:Mr. FengLou Mao
    Peking University
    BeiJing
    P.R.China
Tel:86-10-62751490
Fax:86-10-62751725