Handle Slackware 14.2 in a cleaner way via pkgsrc

Didn't like the hack I was using to work around an old perl before. So
when I noticed that using pkgsrc in Slackware pretty soon puts down a
recent perl as a dependency to many things I decided that using that
would be better than overlaying a newer List::Util version on perl 5.22.

This change detects the newest perl on the system at install time and
puts that in the script interpreter line. It removes the wrapper that
included a library tree with new versions of core Perl modules.

Makefile

@@ -1,15 +1,16 @@
-check:
-	perl -wc frfac
-	perlcritic frfac
+frfac:
+	sed "1d;2i #!`./latest_perl`" frfac.in > frfac
 
-install:
+check:
+	`./latest_perl` -wc frfac.in
+	perlcritic frfac.in
+
+install: frfac
 	install -o root -g wheel -m 0755 -d /usr/local/bin
 	install -o root -g wheel -m 0555 frfac /usr/local/bin
 
-install_with_newcore_hack:
-	install -o root -g wheel -m 0755 -d /usr/local/bin
-	install -o root -g wheel -m 0555 frfac /usr/local/share/perl5/
-	install -o root -g wheel -m 0555 frfac.wrapper /usr/local/bin/frfac
+clean:
+	rm -f frfac
 
 uninstall:
-	rm -f /usr/local/bin/frfac /usr/local/share/perl5/frfac
+	rm -f /usr/local/bin/frfac 

frfac.in

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 # Print the URI of the most recent rfi francais facile episode.
 # Feed this to a downloader. (This script doesn't itself download.)
 

frfac.wrapper

@@ -1,13 +0,0 @@
-#!/bin/sh
-
-# Use a newer List::Util than that in core of the
-# system Perl. E.g. Slackware 14.2's perl is
-# 5.22.2 and only has version 1.41 of List::Util.
-# That version lacks the uniq function.
-# The directory /usr/local/share/newperlcore is
-# expected to have a new List::Util under it
-# install via...
-# perl Makefile.PL INSTALL_BASE=/usr/local/share/newperlcore
-
-perl -I /usr/local/share/newperlcore /usr/local/share/perl5/frfac
-

latest_perl

@@ -0,0 +1,15 @@
+#!/bin/sh
+bestv=0
+for p in $(whereis perl)
+do
+	if [ "$p" != "${p%bin/perl}" ];
+	then
+		v=$($p -V:PERL_VERSION | sed "s/[^']*'//;s/'.*\$//")
+		if [ $v -gt $bestv ]; then
+			best=$p
+			bestv=$($p -V:PERL_VERSION | 
+				sed "s/[^']*'//;s/'.*\$//")
+		fi
+	fi
+done
+echo $best