EXEC SQL INCLUDE syntax

I'm trying to port some Ingres code to PostgreSQL.  For Ingres, I had this bit  
of ESQL:

EXEC SQL INCLUDE '../dcl/master_table.sc';

which ecpg (2.10.0) can't digest with single quotes, and Ingres (2.5) esqlc  
can't digest without single quotes.

Can anyone tell me what the ESQL standard says, and if there is an easy ecpg  
work-around?

Thanks,
Andy