We use Informix's ESQL/C for our project...
adding ESQL/C support to LXR involved the following:
$Id: genxref,v 1.5 1998/04/22 12:16:12 pergj Exp $
add '|ec' after '|cc' on line #329
# $Id: Common.pm,v 1.6 1998/05/14 11:59:22 argggh Exp $
add '|ec' after '|cc' on line #166
That's it... works great