-BuildRequires: libgtkhtml-devel
-BuildRequires: libgnome-devel
-BuildRequires: libgnomeui-devel
-BuildRequires: aspell-devel >= 0.50
+# gtkhtml 3.0 is preferred over libgtkhtml-2* if present, but we have gtkhtml 3.1 now
+%{?with_gtkhtml:BuildRequires: libgtkhtml-devel >= 2.0}
+%{?with_gtkhtml:BuildConflicts: gtkhtml-devel < 3.1}
+BuildRequires: libltdl-devel
+BuildRequires: libgnomeprintui-devel >= 2.1.4
+BuildRequires: libgnomeui-devel >= 2.3.3.1-2
+BuildRequires: libtool
+%{?with_ldap:BuildRequires: openldap-devel}
+BuildRequires: openssl-devel >= 0.9.7d
+BuildRequires: pcre-devel >= 3.0
+BuildRequires: scrollkeeper >= 0.1.4
+Requires: gpgme >= 0.4.3