--- poldek-0.32.2/conf.c~	2016-01-30 15:05:57.000000000 +0100
+++ poldek-0.32.2/conf.c	2018-08-11 18:43:17.635821800 +0200
@@ -1226,8 +1226,12 @@ tn_hash *poldek_conf_addlines(tn_hash *h
         n_strdupap(line, &tmp);
         
         if (split_option_line(tmp, &name, &value, NULL, 0)) {
+            unsigned add_flags = ADD_PARAM_VALIDATE;
+            // allow multiple rpmdef values
+            if (strcmp(name, "rpmdef") != 0)
+                add_flags |= ADD_PARAM_OVERWRITE;
             if (!add_param(ht_sect, sectnam, name, value,
-                           ADD_PARAM_VALIDATE | ADD_PARAM_OVERWRITE, NULL, 0))
+                           add_flags, NULL, 0))
                 nerr++;
         }
     }