add missing dependencies

spandsp/spandsp.spec

@@ -47,8 +47,8 @@ Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
 BuildPreReq:  OpenPKG, openpkg >= 20040130
 PreReq:       OpenPKG, openpkg >= 20040130
-BuildPreReq:  tiff, libxml
-PreReq:       tiff, libxml
+BuildPreReq:  tiff, jpeg, libxml, zlib
+PreReq:       tiff, jpeg, libxml, zlib
 AutoReq:      no
 AutoReqProv:  no