standard libraries

["André Timpanaro" <andre.timpa.deb@gmail.com>]

I tried to compile a C code for the first time in a Debian machine and
apparently gcc can't find the standard libraries.

For example, compiling

#include<stdio.h>

int main(){
printf("Hello World\n");
return 0;
}

gives the following errors:

hello.c:1:19: error: stdio.h: No such file or directory
hello.c: In function 'main':
hello.c:4: warning: incompatible implicit declaration of built-in
function 'printf'

AFAIK the standard libraries should be in /usr/include. A ls in this
directory returns

autosprintf.h  gdict-1.0  gettext-po.h  initreq.h  python2.3  python2.4  X11

can somebody help me?