bc requires flex

bc/bc.spec

@@ -40,7 +40,7 @@ Source0:      ftp://ftp.gnu.org/gnu/bc/%{name}-%{version}.tar.gz
 #   build information
 Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
-BuildPreReq:  OpenPKG, openpkg >= 0.9-20011025.0
+BuildPreReq:  OpenPKG, openpkg >= 0.9-20011025.0, flex
 PreReq:       OpenPKG, openpkg >= 0.9-20011025.0
 AutoReq:      no
 AutoReqProv:  no