diff --git a/cgnslib.spec b/cgnslib.spec
index d935ed2..a644884 100644
--- a/cgnslib.spec
+++ b/cgnslib.spec
@@ -8,8 +8,12 @@ Source0:        http://download.sourceforge.net/project/cgns/cgnslib_3.2/cgnslib
 BuildRequires:  cmake
 BuildRequires:  gcc-gfortran
 BuildRequires:  hdf5-devel
+BuildRequires:  mesa-libGL-devel
+BuildRequires:  mesa-libGLU-devel
+BuildRequires:  tcl
+BuildRequires:  tk
 BuildRequires:  zlib-devel
-Requires:       hdf5 = %{_hdf5_version}
+#Requires:       hdf5 = %{_hdf5_version}
 
 %description
 The Computational Fluid Dynamics General Notation System (CGNS) provides a