_index in file(s)

[Terry Lyons]

Hi ...
I keep finding this message while trying to compile source cod from 
comp.sources.unix 
_index in file(s)
(filename)
*** Error code 1

there seems to be a lot of programs that use this (_index)
my question is from what source do I get _index or does sco Xenix
call this something different?
DS=sco Xenix 286 2.2.1
terry

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