[R] Perl v5.6.0 breaks the configure script

[Dirk Eddelbuettel]

On Wed, Apr 05, 2000 at 10:31:57AM +0100, Prof Brian D Ripley wrote:
> On Wed, 5 Apr 2000, tom kennedy wrote:
[..] 
> I think the trick is to use perl itself, as in
> 
> perl_version=`${PERL} -e '$v=$]; $v =~ s/(.)\..*/\1/;print $v'`
> 
> as perl is guaranteed to return its version as a number like 5.006
> even for `v5.6.0'.
> 
> Unfortunately the "]" in there confuses m4 when building configure
> from aclocal.m4, but I am sure the experts can fix that.

One would be to use the English module and PERL_VERSION instead:

perl_version=
= `${PERL}-MEnglish  -e '$v=$PERL_VERSION; $v =~ s/(.)\..*/\1/;print $v'`

> One could even do the whole test in Perl:
> 
> r_cv_prog_perl_v5=
> `${PERL} -e 'if($] >= 5) {print "yes";} else {print "no"}'`

Likewise:

r_cv_prog_perl_v5=
`${PERL} -MEnglish -e 'if($] >= 5) {print "yes";} else {print "no"}'`

Dirk

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