[eigen3] Fix commit

[Sandro Mani]

commit 50b72873c2925b5dee811d427db6dc90d766675b
Author: Sandro Mani <manisandro at gmail.com>
Date:   Wed Feb 26 18:44:57 2014 +0100

    Fix commit

 eigen3.spec |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/eigen3.spec b/eigen3.spec
index 294c825..a938428 100644
--- a/eigen3.spec
+++ b/eigen3.spec
@@ -1,9 +1,11 @@
 # The (empty) main package is arch, to have the package built and tests run
 # on all arches, but the actual result package is the noarch -devel subpackge.
-# Debuginfo packages are disabled To prevent rpmbuild from generating empty
-# debuginfo packages for the empty main package.
+# Debuginfo packages are disabled to prevent rpmbuild from generating an empty
+# debuginfo package for the empty main package.
 %global debug_package %{nil}
 
+%global commit 6b38706d90a9
+
 Name:           eigen3
 Version:        3.2.1
 Release:        1%{?dist}
@@ -48,7 +50,7 @@ Provides:  %{name}-static = %{version}-%{release}
 %{summary}.
 
 %prep
-%setup -q -n eigen-eigen-ffa86ffb5570
+%setup -q -n eigen-eigen-%{commit}
 
 %build
 mkdir %{_target_platform}