> Try compiling with -E and look at the preprocessor output to find out 
> what the compiler gets to see.

gcc -E     -I. laylex.c

simply gives


FILE *LayYYin = {stdin }, *LayYYout = {stdout };


I can reproduce the problem by creating a file with the following two lines
and compiling it:

#include <stdio.h>
FILE *a = {stdin}, *b = {stdout};



-- 
Georg Schwarz    http://home.pages.de/~schwarz/
 georg.schwarz@freenet.de  +49 178 8545053