Is there any way to compile c-function using pre-processor macro??

The code below is able to be compiled on 8.1.4:
---
if(timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL ) != 0){
        // error
}
---
but not on 8.0.4, since the arguments of timestamp2tm() are changed.

I tried like this:
---
timestamp2tm(timestamp, NULL, tm, &fsec, NULL 
#if PG_VERSION > 8.1
,NULL
#endif
)
---
but couldn't, PG_VERSION is string type.
any other macro or definitions??

Regards, 

Hitoshi Harada



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