I did some testing with gcc versions 4.2.4-6 and 4.3.3-7.  Looks like
gcc-4.3 dropped /usr/include/i486-linux-gnu (and the equivalent on
other arches) from the implicit -I list.  I'm not sure if that was on
purpose, so I'm not reassigning this bug.  It's in GCC maintainers'
domain, either way.

$ gcc-4.2 -v hello.c -o hello
(snip)
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory 
"/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../i486-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/i486-linux-gnu/4.2.4/include
 /usr/include/i486-linux-gnu
 /usr/include
End of search list.
(snip)

$ gcc-4.3 -v hello.c -o hello
(snip)
ignoring nonexistent directory 
"/usr/lib/gcc/i486-linux-gnu/4.3.3/../../../../i486-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/i486-linux-gnu/4.3.3/include
 /usr/lib/gcc/i486-linux-gnu/4.3.3/include-fixed
 /usr/include
End of search list.
(snip)



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