From e3b42cd21e3bd7770b492821a724bb233f7019df Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 24 Aug 2013 12:01:56 +0200
Subject: [PATCH] Avoid reinstalling Math::Libm on Windows every time

---
 Build.PL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Build.PL b/Build.PL
index 16951d7a9..8f4b53ffd 100644
--- a/Build.PL
+++ b/Build.PL
@@ -90,7 +90,7 @@ EOF
     system $cpanm, 'App::cpanminus';
     
     # install the Windows-compatible Math::Libm
-    if ($^O eq 'MSWin32') {
+    if ($^O eq 'MSWin32' && !eval "use Math::Libm; 1") {
         system $cpanm, 'https://github.com/alexrj/Math-Libm/tarball/master';
     }