diff --git a/mrw-c++.spec.in b/mrw-c++.spec.in
index d15c73a..47f420e 100644
--- a/mrw-c++.spec.in
+++ b/mrw-c++.spec.in
@@ -5,14 +5,17 @@ Release: @BUILD_NUMBER@%{?dist}
 License: LGPL
 Group: Development/Libraries/C++
 Source0: %{name}-%{version}.tar.gz
-BuildRequires: subversion, automake, autoconf, doxygen, graphviz
+BuildRequires: subversion, automake, autoconf, doxygen
+%if 0%{?fedora} != 20
+BuildRequires: graphviz
+%fi
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 %if 0%{?fedora} || 0%{?rhel} || 0%{?rhl} || 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version}
 BuildRequires: pkgconfig, cppunit-devel, redhat-lsb
 %else%if 0%{?suse_version} || 0%{?sles_version}
 BuildRequires: pkg-config, libcppunit-devel, lsb-release
 %endif%endif
-%if 0%{?fedora} || 0%{?rhel}
+%if ! ( 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version} )
 BuildRequires: mscgen
 %endif
 
@@ -24,7 +27,7 @@ This package contains only the shared libraries required at runtime.
 
 %prep
 %setup -q
-./configure --prefix=/usr             --docdir=/usr/share/doc/packages/@PACKAGE_NAME@             --libdir=/usr/%_lib
+./configure --prefix=/usr --docdir=/usr/share/doc/packages/@PACKAGE_NAME@ --libdir=/usr/%_lib
 
 %build
 make