'C' enum syntax problem

[Temporary]

I seem to have some problem in using the enum construct on Sun-3
m/c.
The following declarations generate an error.

   typedef enum WEEK {
     MONDAY, TUESDAY, WEDNESDAY,
     THURSDAY, FRIDAY,
     SATURDAY, SUNDAY
   } ;
   typedef enum WEEK_END {
     SATURDAY, SUNDAY
   } ;

The error messages are
	redeclaration of SATURDAY
	redeclaration of SUNDAY

Does it mean that subsets of an enum cannot be defined ?
Is this a bug in my C Compiler ?
What does PAns say about this ?
Is there a work around ?

					Krishna