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  | From tag v6-08-06, 2 March 2017                            |
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Processing compare.C(${startT},${endT})...
input_line_19:2:10: error: use of undeclared identifier '$'
 compare(${startT},${endT}) /* invoking function corresponding to '.x' */
         ^
input_line_19:2:20: error: use of undeclared identifier '$'
 compare(${startT},${endT}) /* invoking function corresponding to '.x' */
                   ^