diff --git a/evolution.spec b/evolution.spec
index df58602..e69796f 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -42,7 +42,7 @@
 
 Name: evolution
 Version: 2.27.3
-Release: 3%{?dist}
+Release: 4%{?dist}
 Group: Applications/Productivity
 Summary: Mail and calendar client for GNOME
 License: GPLv2+ and GFDL
@@ -77,10 +77,8 @@ Requires(postun): scrollkeeper >= %{scrollkeeper_version}
 # Don't trust evolution-data-server to maintain accurate sonames.
 Requires: evolution-data-server >= %{version}
 
-# No devel package for libpst, despite the name.
 Requires: gnome-icon-theme >= %{gnome_icon_theme_version}
 Requires: gnome-themes
-Requires: libpst
 
 ### Build Dependencies ###
 
@@ -111,9 +109,11 @@ BuildRequires: libbonoboui-devel >= %{libbonoboui_version}
 BuildRequires: libgnomecanvas-devel >= 2.0
 BuildRequires: libgnomeui-devel >= 2.0
 BuildRequires: libgweather-devel >= %{libgweather_version}
+BuildRequires: libpst-devel
 BuildRequires: libsoup-devel >= %{soup_version}
 BuildRequires: libtool >= 1.5
 BuildRequires: libxml2-devel
+BuildRequires: libytnef-devel
 BuildRequires: pkgconfig
 
 %if %{use_mozilla_nss}
@@ -673,6 +673,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_libexecdir}/evolution/%{evo_major}/evolution-addressbook-clean
 
 %changelog
+* Thu Jul 02 2009 Matthew Barnes <mbarnes@redhat.com> - 2.27.3-4.fc12
+- Add BR for libpst-devel and libytnef-devel (RH bug #493049).
+
 * Wed Jul 01 2009 Milan Crha <mcrha@redhat.com> - 2.27.3-3.fc12
 - Rebuild against newer gcc