otijim,

You will need to purchase ODBC drivers for HPUX. Also check to make sure you have the ANSI C libraries for HPUX, this is also something that has to be purchased (the included HPUX compiler is not ANSI standard, it will essentially compile a kernel). You will also need to be sure that all the 4GL libraries (esql?) for informix are also installed. (and there is (used to be) a required install order with informix, with 4GL requiring to be installed prior to Informix itself.

In a previous lifetime, I attempted to get Perl, DBI and Informix to play together, but experienced numerous problems getting DBI compiled (DBD/DBI, HPUX and Informix seemed to be inherently problematic at the time, based on dbi-user posts). You'll likely benefit from subscribing to the dbi-users maillist.

My story ended sadly perl-wise, I never got it working and had to use 4GL for my work. I hope your story has a much happier ending!

good luck!