Re: 回复: [Groff] building process stuck wh en building groff-current using MinGW

[Ralph Corderoy]

Hi Yu-ning,

> This is line 49 in Makefile. Line 51 says,
> 
>   revision=`sed -e 's/^0$$//' -e 's/^[1-9].*$$/.&/' $(top_srcdir)/REVISION`
> 
> I wonder the meaning of $$.

In makefiles, one writes `$$' to have a single `$' be passed to the
shell.  Otherwise, `echo $HOME' would tell make to execute `echo fooOME'
if the *make* variable `H' was equal to `foo'.

Cheers,


Ralph.