GNU Programs: how to avoid nana sometimes

Imagine you(12) are building a GNU program. Ideally it should run on systems without any other software including GCC, GDB and even Nana.

To achieve this noble goal you can provide your configure script with a `--without-nana'(13) flag which then `#define's' `WITHOUT_NANA'. You should also use the `VL' macro rather than `L' macro since `L' takes a variable number of arguments and will break non GNU C preprocessors.

int half(int n) {
  /* Don't use L(...) since it takes a variable number of args! */
  VL(("hello world = %d\n", 10)); /* Note the doubled (( */
  ...;
}

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