fix M::B::Compat dying on dotted-decimal requires->perl

git-svn-id: http://svn.perl.org/modules/Module-Build/trunk@13742 50811bd7-b8ce-0310-adc1-d9db26280581

Changes

@@ -2,6 +2,14 @@ Revision history for Perl extension Module::Build.
 
 0.3603 - 
 
+ Bug fixes:
+
+ - Module::Build::Compat would croak on distibutions that set requires
+   'perl' to a dotted decimal like '5.6.2'.  We now skip that key
+   since it doesn't go into PREREQ_PM and we numify it properly for
+   'use 5.006002' in the generated Makefile.PL (RT#53409)
+   [David Golden, adapted from patch by G. Allen Morris III]
+
 0.3602 - Mon Jan 18 22:09:54 EST 2010
 
  Bug fixes:

lib/Module/Build/Compat.pm

@@ -10,6 +10,7 @@ use IO::File;
 use Config;
 use Module::Build;
 use Module::Build::ModuleInfo;
+use Module::Build::Version;
 use Data::Dumper;
 
 my %convert_installdirs = (
@@ -76,6 +77,7 @@ sub _merge_prereq {
   # validate formats
   for my $p ( $req, $breq ) {
     for my $k (keys %$p) {
+      next if $k eq 'perl';
       die "Prereq '$p->{$k}' for '$k' is not supported by Module::Build::Compat\n"
         unless _simple_prereq($p->{$k});
     }
@@ -124,7 +126,8 @@ HERE
   # Makefile.PL
   my $requires = $build->requires;
   if ( my $minimum_perl = $requires->{perl} ) {
-    print {$fh} "require $minimum_perl;\n";
+    my $min_ver = Module::Build::Version->new($minimum_perl)->numify;
+    print {$fh} "require $min_ver;\n";
   }
 
   # If a *bundled* custom subclass is being used, make sure we add its