Is there some kind of problem with using FLT_MIN in ANSI
The C compiler dislikes this construct in ANSI mode:
x = FLT_MIN; /* <---- warning here */
The problem is that the ANSI mode (_PROTOTYPES) version of
FLT_MIN/FLT_MAX in <float.h> end their constants with an F, which seems
to upset the compiler.
The workaround is to temporarily undef _PROTOTYPES around the <float.h>