fix build without TBB

OpenImageIO.spec

@@ -1,6 +1,6 @@
 Name:           OpenImageIO
 Version:        0.10.3
-Release:        4.1%{?dist}
+Release:        4.2%{?dist}
 Summary:        Library for reading and writing images
 
 Group:          Development/Libraries
@@ -18,7 +18,7 @@ BuildRequires:  python2-devel txt2man
 BuildRequires:  libpng-devel libtiff-devel
 BuildRequires:  zlib-devel jasper-devel
 BuildRequires:  pugixml-devel
-BuildRequires:  tbb-devel
+#BuildRequires:  tbb-devel
 BuildRequires:  hdf5-devel Field3D-devel
 
 # We don't want to provide private python extension libs
@@ -107,6 +107,9 @@ cp -a doc/*.1 %{buildroot}%{_mandir}/man1
 
 
 %changelog
+* Mon Apr 09 2012 Dan Horák <dan[at]danny.cz> - 0.10.3-4.2
+- fix build without TBB
+
 * Mon Mar 12 2012 Richard Shaw <hobbes1069@gmail.com> - 0.10.3-4.1
 - Rebuild for updated Field3D library.