NULLs in ecpg

[<wespvp(at)syntegra(dot)com>]

I couldn't find this in the archives...  In an ecpg program, given the
statement (taken from the manual):

EXEC SQL INSERT INTO sometable VALUES (:v1, ¹foo¹, :v2);

Is there a way to create the record where ':v1' is NULL - as with indicators
in a FETCH?  Or, do I have to generate different SQL statements in the C
program?

Wes