How to use constant or define inside the declare section in PostgreSQL's ecpg?

I want to use a constant inside my declare section but ecpg won't allow it.
Is there a workaround? thanks....

foo.pgc
--------------------
#define SIZE 10
EXEC SQL BEGIN DECLARE SECTION;
int foo[SIZE];
EXEC SQL END DECLARE SECTION;

> ecpg foo.pgc
ERROR: parse error, expecting `CVARIABLE' or `ICONST' or `']'' or `'('' at
or near "SIZE"
"dtv.pc", line 42: Error: "}" expected instead of EOF.
1 Error(s) detected.

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