Problems with 5.1 installation on Irix

[gene]

I'm trying to install SRS on an irix machine.  When I run 'srsinstall
all', I get an error message at the '...compiling Icarus file to
object base' step:

SRSDB:srsdb.i:141: error: unknown attribute, class "libloc" has no
attribute "offDir"

Any advice?