Shouldn't be a problem. I defined PTRSIZE and added an #include <stdio.h> and gcc compiled it fine for me. --------------- try this ------------------- #define PTRSIZE 10 #include <stdio.h> union reptr { struct reptr1 { char *ad1; char *ad2; char *re1; char *rhs; FILE *fcode; char command; char gfl; char pfl; char inar; char negfl; }; struct reptr2 { char *ad1; char *ad2; union reptr *lb1; char *rhs; FILE *fcode; char command; char gfl; char pfl; char inar; char negfl; }; } ptrspace[PTRSIZE], *rep; main( ) { printf( "hello world\n" ); } -------------------------------------------- On Thu, Feb 23, 2006 at 07:41:45PM +0300, Sergey Lapin wrote: