--- perl-5.10.0/ext/Math/BigInt/FastCalc/Makefile.PL	2007-12-18 11:47:07.000000000 +0100
+++ perl-5.10.0/ext/Math/BigInt/FastCalc/Makefile.PL	2009-07-10 15:37:39.000000000 +0200
@@ -2,12 +2,18 @@
 
 use strict;
 
+unless($ENV{PERL_CORE}) {
+    $ENV{PERL_CORE} = 1 if grep { $_ eq 'PERL_CORE=1' } @ARGV;
+}
+
 WriteMakefile(
     'NAME'		=> 'Math::BigInt::FastCalc',
     'VERSION_FROM'	=> 'FastCalc.pm',
-    'PREREQ_PM'		=> {
-	'Math::BigInt' => 1.88,
-    },
+    (
+      $ENV{PERL_CORE}
+	? ( )
+	: ('PREREQ_PM'	=> { 'Math::BigInt' => 1.88, } )
+    ),
     INSTALLDIRS		=> 'perl',
     PREREQ_FATAL	=> 1,
     MAN3PODS		=> {},