[OpenImageIO] Fix libpng build requirement.

[Richard Shaw]

commit 31d9ad9c6136042f46ec94d79cf25cd754ecb970
Author: Richard M. Shaw <hobbes1069 at gmail.com>
Date:   Thu Jan 5 13:49:36 2012 -0600

    Fix libpng build requirement.

 OpenImageIO.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/OpenImageIO.spec b/OpenImageIO.spec
index ce53ce6..ac191d4 100644
--- a/OpenImageIO.spec
+++ b/OpenImageIO.spec
@@ -20,7 +20,7 @@ Patch3:         OpenImageIO-0.10.2-Z_BEST_COMPRESSION.patch
 
 BuildRequires:  boost-devel glew-devel qt-devel OpenEXR-devel ilmbase-devel
 BuildRequires:  python2-devel txt2man
-BuildRequires:  libpng libtiff-devel
+BuildRequires:  libpng-devel libtiff-devel
 BuildRequires:  zlib-devel jasper-devel
 BuildRequires:  pugixml-devel
 BuildRequires:  tbb-devel