Bug#665751: Please, close it.
It's not a bug. I'm really sorry.
The output was
In file included from /usr/include/glib-2.0/glib/gmacros.h:40:0,
expected ‘;’, identifier or ‘(’ before ‘long’
But the error wasn't in
/usr/lib/gcc/x86_64-linux-gnu/4.6/include/stddef.h; was in my own .h file.