Help witg sqlite3 egg ?

Hi!,
I am trying to compile the sqlite3
egg on OpenBSD and it errors out with:

fatal error: 'sqlite3.h' file not found
   12 | #include <sqlite3.h>

I am guessing it is because it is at:
/usr/local/include/sqlite3.h

Is there a idiomatic way to add an include
directive to chicken-install to see 
/usr/local/include ?

Or somewhere in the egg install files?

I am looking at them an I see for example:
the 'link-options in sqlite3.egg.

But I don't know how I would specifically do
it.

Thanks for any pointers!
--
Paul Wisehart