 There is a problem with the gcc 2.00 pre processor and FIONREAD
 will not compile properly on gcc 2.00. If you get an error
 message you may need to substitute a value for FIONREAD in
 ElapsedTime. The correct line for a SunsparcOS4 is included
 as a comment. cpp on 2.00 does not substitute in quotes,
 sunOS cc and gcc 1.40 handle this correctly.
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 If you are using gcc (or another ANSI-compatible C compiler) to compile
 gnuchess, but the standard C compiler provided on your operating system is not
 ANSI-compatible, you may have problems compiling the FIONREAD ioctl in
 dspcom.c.  The problem occurs because older versions of the <ioctl.h> header
 file took advantage of a C preprocessor feature that no longer works the same
 way in ANSI C.  If you have this problem, gnuchess will exit with an error
 message referring to FIONREAD whenever you try to run it.
 
 This problem is known to occur on SunOS.
 
 If you have gcc 2.00 or later, you can work around the problem by including
 the "-traditional-cpp" flag on the CFLAGS line in the gnuchess makefile.  Be
 sure to remove the .o files after you make this change so they get recompiled.
 
 If you don't have gcc 2.00, various other workarounds may be possible; for
 instance, you could compile a program that uses FIONREAD with the standard C
 compiler for your operating system, find out what value FIONREAD reduces to,
 and put this value directly into dspcom.c as a #define.  For instance, the
 following program will print out the correct #define:
 
 #include <sys/ioctl.h>
 #ifdef __STDC__
 ERROR Compile me with a non-ANSI compiler!
 #endif
 main()
 {
   printf("#define FIONREAD 0x%x\n", FIONREAD);
 }
