Description of problem:

I just tried to compile package units-1.80-10 from 
Redhat Fedora Core 3 Test 3.

The compiler said

parse.y(384): remark #1011: missing return statement at end of
non-void function "yyerror"

The source code is

yyerror(char *s){}

Suggest the following code

void
yyerror(char *s)
{
}


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