g77 doesn't accept `PARAMETER I=1'.
Supporting this obsolete form of
PARAMETER statement would not be particularly hard, as most of the
parsing code is already in place and working.
Until time/money is
spent implementing it, you might as well fix your code to use the
standard form, `PARAMETER (I=1)' (possibly needing
`INTEGER I' preceding the
PARAMETER statement as well,
otherwise, in the obsolete form of
type of the variable is set from the type of the constant being
assigned to it).