preprocessor

From: <- Chameleon -> (cham_gss_at_hotmail.NOSPAM.com)
Date: 02/28/04 

Date: Sat, 28 Feb 2004 03:55:05 +0200

I have a preprocessor constant (SUPPORT_PNG_IMAGE) with 3 states, to control the compilation:
---------
#undef SUPPORT_PNG_IMAGE
#define SUPPORT_PNG_IMAGE
#define SUPPORT_PNG_IMAGE ONLY
---------
With the 1st & 3rd line the following line works
---------
#if SUPPORT_PNG_IMAGE == ONLY
---------
but with the 2nd, compiler throws:
---------
fatal error C1017: invalid integer constant expression
---------

how can I handle this?

thanks

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