how solve diff of API counstruct_md_array between 8.1 and 8.2?

Hello

I use counstruct_md_array function in my Orafunc module. CVS version has 
diff def now. I am findig way for simple solution of maintaince source code 
for both version. I have PG_VERSION variable, but it's unusable. Is there 
way for contrib's autors differentiate PostgreSQL versions? I don't want to 
have two versions of source code.

Thank you
Pavel Stehule

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