diff --git a/cgnslib.spec b/cgnslib.spec
index 8f23016..c7575e7 100644
--- a/cgnslib.spec
+++ b/cgnslib.spec
@@ -8,6 +8,7 @@ Source0:        http://download.sourceforge.net/project/cgns/cgnslib_3.2/cgnslib
 BuildRequires:  cmake
 BuildRequires:  gcc-gfortran
 BuildRequires:  hdf5-devel
+BuildRequires:  libXmu-devel
 BuildRequires:  mesa-libGL-devel
 BuildRequires:  mesa-libGLU-devel
 BuildRequires:  tcl-devel